Python Documentation contents

• What’s New in Python
  • What’s New In Python 3.2
    • PEP 384: Defining a Stable ABI
    • PEP 389: Argparse Command Line Parsing Module
    • PEP 391: Dictionary Based Configuration for Logging
    • PEP 3148: The concurrent.futures module
    • PEP 3147: PYC Repository Directories
    • PEP 3149: ABI Version Tagged .so Files
    • PEP 3333: Python Web Server Gateway Interface v1.0.1
    • Other Language Changes
    • New, Improved, and Deprecated Modules
      • email
      • elementtree
      • functools
      • itertools
      • collections
      • threading
      • datetime and time
      • math
      • abc
      • io
      • reprlib
      • logging
      • csv
      • contextlib
      • decimal and fractions
      • ftp
      • popen
      • select
      • gzip and zipfile
      • tarfile
      • hashlib
      • ast
      • os
      • shutil
      • sqlite3
      • html
      • socket
      • ssl
      • nntp
      • certificates
      • imaplib
      • http.client
      • unittest
      • random
      • poplib
      • asyncore
      • tempfile
      • inspect
      • pydoc
      • dis
      • dbm
      • ctypes
      • site
      • sysconfig
      • pdb
      • configparser
      • urllib.parse
      • mailbox
      • turtledemo
    • Multi-threading
    • Optimizations
    • Unicode
    • Codecs
    • Documentation
    • IDLE
    • Code Repository
    • Build and C API Changes
    • Porting to Python 3.2
  • What’s New In Python 3.1
    • PEP 372: Ordered Dictionaries
    • PEP 378: Format Specifier for Thousands Separator
    • Other Language Changes
    • New, Improved, and Deprecated Modules
    • Optimizations
    • IDLE
    • Build and C API Changes
    • Porting to Python 3.1
  • What’s New In Python 3.0
    • Common Stumbling Blocks
      • Print Is A Function
      • Views And Iterators Instead Of Lists
      • Ordering Comparisons
      • Integers
      • Text Vs. Data Instead Of Unicode Vs. 8-bit
    • Overview Of Syntax Changes
      • New Syntax
      • Changed Syntax
      • Removed Syntax
    • Changes Already Present In Python 2.6
    • Library Changes
    • PEP 3101: A New Approach To String Formatting
    • Changes To Exceptions
    • Miscellaneous Other Changes
      • Operators And Special Methods
      • Builtins
    • Build and C API Changes
    • Performance
    • Porting To Python 3.0
  • What’s New in Python 2.7
    • The Future for Python 2.x
    • Python 3.1 Features
    • PEP 372: Adding an Ordered Dictionary to collections
    • PEP 378: Format Specifier for Thousands Separator
    • PEP 389: The argparse Module for Parsing Command Lines
    • PEP 391: Dictionary-Based Configuration For Logging
    • PEP 3106: Dictionary Views
    • PEP 3137: The memoryview Object
    • Other Language Changes
      • Interpreter Changes
      • Optimizations
    • New and Improved Modules
      • New module: importlib
      • New module: sysconfig
      • ttk: Themed Widgets for Tk
      • Updated module: unittest
      • Updated module: ElementTree 1.3
    • Build and C API Changes
      • Capsules
      • Port-Specific Changes: Windows
      • Port-Specific Changes: Mac OS X
      • Port-Specific Changes: FreeBSD
    • Other Changes and Fixes
    • Porting to Python 2.7
    • Acknowledgements
  • What’s New in Python 2.6
    • Python 3.0
    • Changes to the Development Process
      • New Issue Tracker: Roundup
      • New Documentation Format: reStructuredText Using Sphinx
    • PEP 343: The ‘with’ statement
      • Writing Context Managers
      • The contextlib module
    • PEP 366: Explicit Relative Imports From a Main Module
    • PEP 370: Per-user site-packages Directory
    • PEP 371: The multiprocessing Package
    • PEP 3101: Advanced String Formatting
    • PEP 3105: print As a Function
    • PEP 3110: Exception-Handling Changes
    • PEP 3112: Byte Literals
    • PEP 3116: New I/O Library
    • PEP 3118: Revised Buffer Protocol
    • PEP 3119: Abstract Base Classes
    • PEP 3127: Integer Literal Support and Syntax
    • PEP 3129: Class Decorators
    • PEP 3141: A Type Hierarchy for Numbers
      • The fractions Module
    • Other Language Changes
      • Optimizations
      • Interpreter Changes
    • New and Improved Modules
      • The ast module
      • The future_builtins module
      • The json module: JavaScript Object Notation
      • The plistlib module: A Property-List Parser
      • ctypes Enhancements
      • Improved SSL Support
    • Deprecations and Removals
    • Build and C API Changes
      • Port-Specific Changes: Windows
      • Port-Specific Changes: Mac OS X
      • Port-Specific Changes: IRIX
    • Porting to Python 2.6
    • Acknowledgements
  • What’s New in Python 2.5
    • PEP 308: Conditional Expressions
    • PEP 309: Partial Function Application
    • PEP 314: Metadata for Python Software Packages v1.1
    • PEP 328: Absolute and Relative Imports
    • PEP 338: Executing Modules as Scripts
    • PEP 341: Unified try/except/finally
    • PEP 342: New Generator Features
    • PEP 343: The ‘with’ statement
      • Writing Context Managers
      • The contextlib module
    • PEP 352: Exceptions as New-Style Classes
    • PEP 353: Using ssize_t as the index type
    • PEP 357: The ‘__index__’ method
    • Other Language Changes
      • Interactive Interpreter Changes
      • Optimizations
    • New, Improved, and Removed Modules
      • The ctypes package
      • The ElementTree package
      • The hashlib package
      • The sqlite3 package
      • The wsgiref package
    • Build and C API Changes
      • Port-Specific Changes
    • Porting to Python 2.5
    • Acknowledgements
  • What’s New in Python 2.4
    • PEP 218: Built-In Set Objects
    • PEP 237: Unifying Long Integers and Integers
    • PEP 289: Generator Expressions
    • PEP 292: Simpler String Substitutions
    • PEP 318: Decorators for Functions and Methods
    • PEP 322: Reverse Iteration
    • PEP 324: New subprocess Module
    • PEP 327: Decimal Data Type
      • Why is Decimal needed?
      • The Decimal type
      • The Context type
    • PEP 328: Multi-line Imports
    • PEP 331: Locale-Independent Float/String Conversions
    • Other Language Changes
      • Optimizations
    • New, Improved, and Deprecated Modules
      • cookielib
      • doctest
    • Build and C API Changes
      • Port-Specific Changes
    • Porting to Python 2.4
    • Acknowledgements
  • What’s New in Python 2.3
    • PEP 218: A Standard Set Datatype
    • PEP 255: Simple Generators
    • PEP 263: Source Code Encodings
    • PEP 273: Importing Modules from ZIP Archives
    • PEP 277: Unicode file name support for Windows NT
    • PEP 278: Universal Newline Support
    • PEP 279: enumerate()
    • PEP 282: The logging Package
    • PEP 285: A Boolean Type
    • PEP 293: Codec Error Handling Callbacks
    • PEP 301: Package Index and Metadata for Distutils
    • PEP 302: New Import Hooks
    • PEP 305: Comma-separated Files
    • PEP 307: Pickle Enhancements
    • Extended Slices
    • Other Language Changes
      • String Changes
      • Optimizations
    • New, Improved, and Deprecated Modules
      • Date/Time Type
      • The optparse Module
    • Pymalloc: A Specialized Object Allocator
    • Build and C API Changes
      • Port-Specific Changes
    • Other Changes and Fixes
    • Porting to Python 2.3
    • Acknowledgements
  • What’s New in Python 2.2
    • Introduction
    • PEPs 252 and 253: Type and Class Changes
      • Old and New Classes
      • Descriptors
      • Multiple Inheritance: The Diamond Rule
      • Attribute Access
      • Related Links
    • PEP 234: Iterators
    • PEP 255: Simple Generators
    • PEP 237: Unifying Long Integers and Integers
    • PEP 238: Changing the Division Operator
    • Unicode Changes
    • PEP 227: Nested Scopes
    • New and Improved Modules
    • Interpreter Changes and Fixes
    • Other Changes and Fixes
    • Acknowledgements
  • What’s New in Python 2.1
    • Introduction
    • PEP 227: Nested Scopes
    • PEP 236: __future__ Directives
    • PEP 207: Rich Comparisons
    • PEP 230: Warning Framework
    • PEP 229: New Build System
    • PEP 205: Weak References
    • PEP 232: Function Attributes
    • PEP 235: Importing Modules on Case-Insensitive Platforms
    • PEP 217: Interactive Display Hook
    • PEP 208: New Coercion Model
    • PEP 241: Metadata in Python Packages
    • New and Improved Modules
    • Other Changes and Fixes
    • Acknowledgements
  • What’s New in Python 2.0
    • Introduction
    • What About Python 1.6?
    • New Development Process
    • Unicode
    • List Comprehensions
    • Augmented Assignment
    • String Methods
    • Garbage Collection of Cycles
    • Other Core Changes
      • Minor Language Changes
      • Changes to Built-in Functions
    • Porting to 2.0
    • Extending/Embedding Changes
    • Distutils: Making Modules Easy to Install
    • XML Modules
      • SAX2 Support
      • DOM Support
      • Relationship to PyXML
    • Module changes
    • New modules
    • IDLE Improvements
    • Deleted and Deprecated Modules
    • Acknowledgements
• The Python Tutorial
  • 1. Whetting Your Appetite
  • 2. Using the Python Interpreter
    • 2.1. Invoking the Interpreter
      • 2.1.1. Argument Passing
      • 2.1.2. Interactive Mode
    • 2.2. The Interpreter and Its Environment
      • 2.2.1. Error Handling
      • 2.2.2. Executable Python Scripts
      • 2.2.3. Source Code Encoding
      • 2.2.4. The Interactive Startup File
      • 2.2.5. The Customization Modules
  • 3. An Informal Introduction to Python
    • 3.1. Using Python as a Calculator
      • 3.1.1. Numbers
      • 3.1.2. Strings
      • 3.1.3. About Unicode
      • 3.1.4. Lists
    • 3.2. First Steps Towards Programming
  • 4. More Control Flow Tools
    • 4.1. if Statements
    • 4.2. for Statements
    • 4.3. The range() Function
    • 4.4. break and continue Statements, and else Clauses on Loops
    • 4.5. pass Statements
    • 4.6. Defining Functions
    • 4.7. More on Defining Functions
      • 4.7.1. Default Argument Values
      • 4.7.2. Keyword Arguments
      • 4.7.3. Arbitrary Argument Lists
      • 4.7.4. Unpacking Argument Lists
      • 4.7.5. Lambda Forms
      • 4.7.6. Documentation Strings
    • 4.8. Intermezzo: Coding Style
  • 5. Data Structures
    • 5.1. More on Lists
      • 5.1.1. Using Lists as Stacks
      • 5.1.2. Using Lists as Queues
      • 5.1.3. List Comprehensions
      • 5.1.4. Nested List Comprehensions
    • 5.2. The del statement
    • 5.3. Tuples and Sequences
    • 5.4. Sets
    • 5.5. Dictionaries
    • 5.6. Looping Techniques
    • 5.7. More on Conditions
    • 5.8. Comparing Sequences and Other Types
  • 6. Modules
    • 6.1. More on Modules
      • 6.1.1. Executing modules as scripts
      • 6.1.2. The Module Search Path
      • 6.1.3. “Compiled” Python files
    • 6.2. Standard Modules
    • 6.3. The dir() Function
    • 6.4. Packages
      • 6.4.1. Importing * From a Package
      • 6.4.2. Intra-package References
      • 6.4.3. Packages in Multiple Directories
  • 7. Input and Output
    • 7.1. Fancier Output Formatting
      • 7.1.1. Old string formatting
    • 7.2. Reading and Writing Files
      • 7.2.1. Methods of File Objects
      • 7.2.2. The pickle Module
  • 8. Errors and Exceptions
    • 8.1. Syntax Errors
    • 8.2. Exceptions
    • 8.3. Handling Exceptions
    • 8.4. Raising Exceptions
    • 8.5. User-defined Exceptions
    • 8.6. Defining Clean-up Actions
    • 8.7. Predefined Clean-up Actions
  • 9. Classes
    • 9.1. A Word About Names and Objects
    • 9.2. Python Scopes and Namespaces
      • 9.2.1. Scopes and Namespaces Example
    • 9.3. A First Look at Classes
      • 9.3.1. Class Definition Syntax
      • 9.3.2. Class Objects
      • 9.3.3. Instance Objects
      • 9.3.4. Method Objects
    • 9.4. Random Remarks
    • 9.5. Inheritance
      • 9.5.1. Multiple Inheritance
    • 9.6. Private Variables
    • 9.7. Odds and Ends
    • 9.8. Exceptions Are Classes Too
    • 9.9. Iterators
    • 9.10. Generators
    • 9.11. Generator Expressions
  • 10. Brief Tour of the Standard Library
    • 10.1. Operating System Interface
    • 10.2. File Wildcards
    • 10.3. Command Line Arguments
    • 10.4. Error Output Redirection and Program Termination
    • 10.5. String Pattern Matching
    • 10.6. Mathematics
    • 10.7. Internet Access
    • 10.8. Dates and Times
    • 10.9. Data Compression
    • 10.10. Performance Measurement
    • 10.11. Quality Control
    • 10.12. Batteries Included
  • 11. Brief Tour of the Standard Library – Part II
    • 11.1. Output Formatting
    • 11.2. Templating
    • 11.3. Working with Binary Data Record Layouts
    • 11.4. Multi-threading
    • 11.5. Logging
    • 11.6. Weak References
    • 11.7. Tools for Working with Lists
    • 11.8. Decimal Floating Point Arithmetic
  • 12. What Now?
  • 13. Interactive Input Editing and History Substitution
    • 13.1. Line Editing
    • 13.2. History Substitution
    • 13.3. Key Bindings
    • 13.4. Alternatives to the Interactive Interpreter
  • 14. Floating Point Arithmetic: Issues and Limitations
    • 14.1. Representation Error
• Python Setup and Usage
  • 1. Command line and environment
    • 1.1. Command line
      • 1.1.1. Interface options
      • 1.1.2. Generic options
      • 1.1.3. Miscellaneous options
      • 1.1.4. Options you shouldn’t use
    • 1.2. Environment variables
      • 1.2.1. Debug-mode variables
  • 2. Using Python on Unix platforms
    • 2.1. Getting and installing the latest version of Python
      • 2.1.1. On Linux
      • 2.1.2. On FreeBSD and OpenBSD
      • 2.1.3. On OpenSolaris
    • 2.2. Building Python
    • 2.3. Python-related paths and files
    • 2.4. Miscellaneous
    • 2.5. Editors
  • 3. Using Python on Windows
    • 3.1. Installing Python
    • 3.2. Alternative bundles
    • 3.3. Configuring Python
      • 3.3.1. Excursus: Setting environment variables
      • 3.3.2. Finding the Python executable
      • 3.3.3. Finding modules
      • 3.3.4. Executing scripts
    • 3.4. Additional modules
      • 3.4.1. PyWin32
      • 3.4.2. Py2exe
      • 3.4.3. WConio
    • 3.5. Compiling Python on Windows
    • 3.6. Other resources
  • 4. Using Python on a Macintosh
    • 4.1. Getting and Installing MacPython
      • 4.1.1. How to run a Python script
      • 4.1.2. Running scripts with a GUI
      • 4.1.3. Configuration
    • 4.2. The IDE
    • 4.3. Installing Additional Python Packages
    • 4.4. GUI Programming on the Mac
    • 4.5. Distributing Python Applications on the Mac
    • 4.6. Application Scripting
    • 4.7. Other Resources
• The Python Language Reference
  • 1. Introduction
    • 1.1. Alternate Implementations
    • 1.2. Notation
  • 2. Lexical analysis
    • 2.1. Line structure
      • 2.1.1. Logical lines
      • 2.1.2. Physical lines
      • 2.1.3. Comments
      • 2.1.4. Encoding declarations
      • 2.1.5. Explicit line joining
      • 2.1.6. Implicit line joining
      • 2.1.7. Blank lines
      • 2.1.8. Indentation
      • 2.1.9. Whitespace between tokens
    • 2.2. Other tokens
    • 2.3. Identifiers and keywords
      • 2.3.1. Keywords
      • 2.3.2. Reserved classes of identifiers
    • 2.4. Literals
      • 2.4.1. String and Bytes literals
      • 2.4.2. String literal concatenation
      • 2.4.3. Numeric literals
      • 2.4.4. Integer literals
      • 2.4.5. Floating point literals
      • 2.4.6. Imaginary literals
    • 2.5. Operators
    • 2.6. Delimiters
  • 3. Data model
    • 3.1. Objects, values and types
    • 3.2. The standard type hierarchy
    • 3.3. Special method names
      • 3.3.1. Basic customization
      • 3.3.2. Customizing attribute access
        • 3.3.2.1. Implementing Descriptors
        • 3.3.2.2. Invoking Descriptors
        • 3.3.2.3. __slots__
          • 3.3.2.3.1. Notes on using __slots__
      • 3.3.3. Customizing class creation
      • 3.3.4. Customizing instance and subclass checks
      • 3.3.5. Emulating callable objects
      • 3.3.6. Emulating container types
      • 3.3.7. Emulating numeric types
      • 3.3.8. With Statement Context Managers
      • 3.3.9. Special method lookup
  • 4. Execution model
    • 4.1. Naming and binding
      • 4.1.1. Interaction with dynamic features
    • 4.2. Exceptions
  • 5. Expressions
    • 5.1. Arithmetic conversions
    • 5.2. Atoms
      • 5.2.1. Identifiers (Names)
      • 5.2.2. Literals
      • 5.2.3. Parenthesized forms
      • 5.2.4. Displays for lists, sets and dictionaries
      • 5.2.5. List displays
      • 5.2.6. Set displays
      • 5.2.7. Dictionary displays
      • 5.2.8. Generator expressions
      • 5.2.9. Yield expressions
    • 5.3. Primaries
      • 5.3.1. Attribute references
      • 5.3.2. Subscriptions
      • 5.3.3. Slicings
      • 5.3.4. Calls
    • 5.4. The power operator
    • 5.5. Unary arithmetic and bitwise operations
    • 5.6. Binary arithmetic operations
    • 5.7. Shifting operations
    • 5.8. Binary bitwise operations
    • 5.9. Comparisons
    • 5.10. Boolean operations
    • 5.11. Conditional expressions
    • 5.12. Lambdas
    • 5.13. Expression lists
    • 5.14. Evaluation order
    • 5.15. Summary
  • 6. Simple statements
    • 6.1. Expression statements
    • 6.2. Assignment statements
      • 6.2.1. Augmented assignment statements
    • 6.3. The assert statement
    • 6.4. The pass statement
    • 6.5. The del statement
    • 6.6. The return statement
    • 6.7. The yield statement
    • 6.8. The raise statement
    • 6.9. The break statement
    • 6.10. The continue statement
    • 6.11. The import statement
      • 6.11.1. Future statements
    • 6.12. The global statement
    • 6.13. The nonlocal statement
  • 7. Compound statements
    • 7.1. The if statement
    • 7.2. The while statement
    • 7.3. The for statement
    • 7.4. The try statement
    • 7.5. The with statement
    • 7.6. Function definitions
    • 7.7. Class definitions
  • 8. Top-level components
    • 8.1. Complete Python programs
    • 8.2. File input
    • 8.3. Interactive input
    • 8.4. Expression input
  • 9. Full Grammar specification
• The Python Standard Library
  • 1. Introduction
  • 2. Built-in Functions
  • 3. Built-in Constants
    • 3.1. Constants added by the site module
  • 4. Built-in Types
    • 4.1. Truth Value Testing
    • 4.2. Boolean Operations — and, or, not
    • 4.3. Comparisons
    • 4.4. Numeric Types — int, float, complex
      • 4.4.1. Bitwise Operations on Integer Types
      • 4.4.2. Additional Methods on Integer Types
      • 4.4.3. Additional Methods on Float
      • 4.4.4. Hashing of numeric types
    • 4.5. Iterator Types
      • 4.5.1. Generator Types
    • 4.6. Sequence Types — str, bytes, bytearray, list, tuple, range
      • 4.6.1. String Methods
      • 4.6.2. Old String Formatting Operations
      • 4.6.3. Range Type
      • 4.6.4. Mutable Sequence Types
      • 4.6.5. Bytes and Byte Array Methods
    • 4.7. Set Types — set, frozenset
    • 4.8. Mapping Types — dict
      • 4.8.1. Dictionary view objects
    • 4.9. memoryview type
    • 4.10. Context Manager Types
    • 4.11. Other Built-in Types
      • 4.11.1. Modules
      • 4.11.2. Classes and Class Instances
      • 4.11.3. Functions
      • 4.11.4. Methods
      • 4.11.5. Code Objects
      • 4.11.6. Type Objects
      • 4.11.7. The Null Object
      • 4.11.8. The Ellipsis Object
      • 4.11.9. The NotImplemented Object
      • 4.11.10. Boolean Values
      • 4.11.11. Internal Objects
    • 4.12. Special Attributes
  • 5. Built-in Exceptions
    • 5.1. Exception hierarchy
  • 6. String Services
    • 6.1. string — Common string operations
      • 6.1.1. String constants
      • 6.1.2. String Formatting
      • 6.1.3. Format String Syntax
        • 6.1.3.1. Format Specification Mini-Language
        • 6.1.3.2. Format examples
      • 6.1.4. Template strings
      • 6.1.5. Helper functions
    • 6.2. re — Regular expression operations
      • 6.2.1. Regular Expression Syntax
      • 6.2.2. Module Contents
      • 6.2.3. Regular Expression Objects
      • 6.2.4. Match Objects
      • 6.2.5. Regular Expression Examples
        • 6.2.5.1. Checking for a Pair
        • 6.2.5.2. Simulating scanf()
        • 6.2.5.3. search() vs. match()
        • 6.2.5.4. Making a Phonebook
        • 6.2.5.5. Text Munging
        • 6.2.5.6. Finding all Adverbs
        • 6.2.5.7. Finding all Adverbs and their Positions
        • 6.2.5.8. Raw String Notation
        • 6.2.5.9. Writing a Tokenizer
    • 6.3. struct — Interpret bytes as packed binary data
      • 6.3.1. Functions and Exceptions
      • 6.3.2. Format Strings
        • 6.3.2.1. Byte Order, Size, and Alignment
        • 6.3.2.2. Format Characters
        • 6.3.2.3. Examples
      • 6.3.3. Classes
    • 6.4. difflib — Helpers for computing deltas
      • 6.4.1. SequenceMatcher Objects
      • 6.4.2. SequenceMatcher Examples
      • 6.4.3. Differ Objects
      • 6.4.4. Differ Example
      • 6.4.5. A command-line interface to difflib
    • 6.5. textwrap — Text wrapping and filling
    • 6.6. codecs — Codec registry and base classes
      • 6.6.1. Codec Base Classes
        • 6.6.1.1. Codec Objects
        • 6.6.1.2. IncrementalEncoder Objects
        • 6.6.1.3. IncrementalDecoder Objects
        • 6.6.1.4. StreamWriter Objects
        • 6.6.1.5. StreamReader Objects
        • 6.6.1.6. StreamReaderWriter Objects
        • 6.6.1.7. StreamRecoder Objects
      • 6.6.2. Encodings and Unicode
      • 6.6.3. Standard Encodings
      • 6.6.4. encodings.idna — Internationalized Domain Names in Applications
      • 6.6.5. encodings.mbcs — Windows ANSI codepage
      • 6.6.6. encodings.utf_8_sig — UTF-8 codec with BOM signature
    • 6.7. unicodedata — Unicode Database
    • 6.8. stringprep — Internet String Preparation
  • 7. Data Types
    • 7.1. datetime — Basic date and time types
      • 7.1.1. Available Types
      • 7.1.2. timedelta Objects
      • 7.1.3. date Objects
      • 7.1.4. datetime Objects
      • 7.1.5. time Objects
      • 7.1.6. tzinfo Objects
      • 7.1.7. timezone Objects
      • 7.1.8. strftime() and strptime() Behavior
    • 7.2. calendar — General calendar-related functions
    • 7.3. collections — Container datatypes
      • 7.3.1. Counter objects
      • 7.3.2. deque objects
        • 7.3.2.1. deque Recipes
      • 7.3.3. defaultdict objects
        • 7.3.3.1. defaultdict Examples
      • 7.3.4. namedtuple() Factory Function for Tuples with Named Fields
      • 7.3.5. OrderedDict objects
        • 7.3.5.1. OrderedDict Examples and Recipes
      • 7.3.6. UserDict objects
      • 7.3.7. UserList objects
      • 7.3.8. UserString objects
      • 7.3.9. ABCs - abstract base classes
    • 7.4. heapq — Heap queue algorithm
      • 7.4.1. Basic Examples
      • 7.4.2. Priority Queue Implementation Notes
      • 7.4.3. Theory
    • 7.5. bisect — Array bisection algorithm
      • 7.5.1. Searching Sorted Lists
      • 7.5.2. Other Examples
    • 7.6. array — Efficient arrays of numeric values
    • 7.7. sched — Event scheduler
      • 7.7.1. Scheduler Objects
    • 7.8. queue — A synchronized queue class
      • 7.8.1. Queue Objects
    • 7.9. weakref — Weak references
      • 7.9.1. Weak Reference Objects
      • 7.9.2. Example
    • 7.10. types — Names for built-in types
    • 7.11. copy — Shallow and deep copy operations
    • 7.12. pprint — Data pretty printer
      • 7.12.1. PrettyPrinter Objects
      • 7.12.2. Example
    • 7.13. reprlib — Alternate repr() implementation
      • 7.13.1. Repr Objects
      • 7.13.2. Subclassing Repr Objects
  • 8. Numeric and Mathematical Modules
    • 8.1. numbers — Numeric abstract base classes
      • 8.1.1. The numeric tower
      • 8.1.2. Notes for type implementors
        • 8.1.2.1. Adding More Numeric ABCs
        • 8.1.2.2. Implementing the arithmetic operations
    • 8.2. math — Mathematical functions
      • 8.2.1. Number-theoretic and representation functions
      • 8.2.2. Power and logarithmic functions
      • 8.2.3. Trigonometric functions
      • 8.2.4. Angular conversion
      • 8.2.5. Hyperbolic functions
      • 8.2.6. Special functions
      • 8.2.7. Constants
    • 8.3. cmath — Mathematical functions for complex numbers
      • 8.3.1. Conversions to and from polar coordinates
      • 8.3.2. Power and logarithmic functions
      • 8.3.3. Trigonometric functions
      • 8.3.4. Hyperbolic functions
      • 8.3.5. Classification functions
      • 8.3.6. Constants
    • 8.4. decimal — Decimal fixed point and floating point arithmetic
      • 8.4.1. Quick-start Tutorial
      • 8.4.2. Decimal objects
        • 8.4.2.1. Logical operands
      • 8.4.3. Context objects
      • 8.4.4. Signals
      • 8.4.5. Floating Point Notes
        • 8.4.5.1. Mitigating round-off error with increased precision
        • 8.4.5.2. Special values
      • 8.4.6. Working with threads
      • 8.4.7. Recipes
      • 8.4.8. Decimal FAQ
    • 8.5. fractions — Rational numbers
    • 8.6. random — Generate pseudo-random numbers
      • 8.6.1. Notes on Reproducibility
      • 8.6.2. Examples and Recipes
  • 9. Functional Programming Modules
    • 9.1. itertools — Functions creating iterators for efficient looping
      • 9.1.1. Itertool functions
      • 9.1.2. Itertools Recipes
    • 9.2. functools — Higher-order functions and operations on callable objects
      • 9.2.1. partial Objects
    • 9.3. operator — Standard operators as functions
      • 9.3.1. Mapping Operators to Functions
    • 9.4. Inplace Operators
  • 10. File and Directory Access
    • 10.1. os.path — Common pathname manipulations
    • 10.2. fileinput — Iterate over lines from multiple input streams
    • 10.3. stat — Interpreting stat() results
    • 10.4. filecmp — File and Directory Comparisons
      • 10.4.1. The dircmp class
    • 10.5. tempfile — Generate temporary files and directories
      • 10.5.1. Examples
    • 10.6. glob — Unix style pathname pattern expansion
    • 10.7. fnmatch — Unix filename pattern matching
    • 10.8. linecache — Random access to text lines
    • 10.9. shutil — High-level file operations
      • 10.9.1. Directory and files operations
        • 10.9.1.1. copytree example
      • 10.9.2. Archiving operations
        • 10.9.2.1. Archiving example
    • 10.10. macpath — Mac OS 9 path manipulation functions
  • 11. Data Persistence
    • 11.1. pickle — Python object serialization
      • 11.1.1. Relationship to other Python modules
      • 11.1.2. Data stream format
      • 11.1.3. Module Interface
      • 11.1.4. What can be pickled and unpickled?
      • 11.1.5. Pickling Class Instances
        • 11.1.5.1. Persistence of External Objects
        • 11.1.5.2. Handling Stateful Objects
      • 11.1.6. Restricting Globals
      • 11.1.7. Examples
    • 11.2. copyreg — Register pickle support functions
    • 11.3. shelve — Python object persistence
      • 11.3.1. Restrictions
      • 11.3.2. Example
    • 11.4. marshal — Internal Python object serialization
    • 11.5. dbm — Interfaces to Unix “databases”
      • 11.5.1. dbm.gnu — GNU’s reinterpretation of dbm
      • 11.5.2. dbm.ndbm — Interface based on ndbm
      • 11.5.3. dbm.dumb — Portable DBM implementation
    • 11.6. sqlite3 — DB-API 2.0 interface for SQLite databases
      • 11.6.1. Module functions and constants
      • 11.6.2. Connection Objects
      • 11.6.3. Cursor Objects
      • 11.6.4. Row Objects
      • 11.6.5. SQLite and Python types
        • 11.6.5.1. Introduction
        • 11.6.5.2. Using adapters to store additional Python types in SQLite databases
          • 11.6.5.2.1. Letting your object adapt itself
          • 11.6.5.2.2. Registering an adapter callable
        • 11.6.5.3. Converting SQLite values to custom Python types
        • 11.6.5.4. Default adapters and converters
      • 11.6.6. Controlling Transactions
      • 11.6.7. Using sqlite3 efficiently
        • 11.6.7.1. Using shortcut methods
        • 11.6.7.2. Accessing columns by name instead of by index
        • 11.6.7.3. Using the connection as a context manager
      • 11.6.8. Common issues
        • 11.6.8.1. Multithreading
  • 12. Data Compression and Archiving
    • 12.1. zlib — Compression compatible with gzip
    • 12.2. gzip — Support for gzip files
      • 12.2.1. Examples of usage
    • 12.3. bz2 — Compression compatible with bzip2
      • 12.3.1. (De)compression of files
      • 12.3.2. Sequential (de)compression
      • 12.3.3. One-shot (de)compression
    • 12.4. zipfile — Work with ZIP archives
      • 12.4.1. ZipFile Objects
      • 12.4.2. PyZipFile Objects
      • 12.4.3. ZipInfo Objects
    • 12.5. tarfile — Read and write tar archive files
      • 12.5.1. TarFile Objects
      • 12.5.2. TarInfo Objects
      • 12.5.3. Examples
      • 12.5.4. Supported tar formats
      • 12.5.5. Unicode issues
  • 13. File Formats
    • 13.1. csv — CSV File Reading and Writing
      • 13.1.1. Module Contents
      • 13.1.2. Dialects and Formatting Parameters
      • 13.1.3. Reader Objects
      • 13.1.4. Writer Objects
      • 13.1.5. Examples
    • 13.2. configparser — Configuration file parser
      • 13.2.1. Quick Start
      • 13.2.2. Supported Datatypes
      • 13.2.3. Fallback Values
      • 13.2.4. Supported INI File Structure
      • 13.2.5. Interpolation of values
      • 13.2.6. Mapping Protocol Access
      • 13.2.7. Customizing Parser Behaviour
      • 13.2.8. Legacy API Examples
      • 13.2.9. ConfigParser Objects
      • 13.2.10. RawConfigParser Objects
      • 13.2.11. Exceptions
    • 13.3. netrc — netrc file processing
      • 13.3.1. netrc Objects
    • 13.4. xdrlib — Encode and decode XDR data
      • 13.4.1. Packer Objects
      • 13.4.2. Unpacker Objects
      • 13.4.3. Exceptions
    • 13.5. plistlib — Generate and parse Mac OS X .plist files
      • 13.5.1. Examples
  • 14. Cryptographic Services
    • 14.1. hashlib — Secure hashes and message digests
    • 14.2. hmac — Keyed-Hashing for Message Authentication
  • 15. Generic Operating System Services
    • 15.1. os — Miscellaneous operating system interfaces
      • 15.1.1. File Names, Command Line Arguments, and Environment Variables
      • 15.1.2. Process Parameters
      • 15.1.3. File Object Creation
      • 15.1.4. File Descriptor Operations
        • 15.1.4.1. open() flag constants
      • 15.1.5. Files and Directories
      • 15.1.6. Process Management
      • 15.1.7. Miscellaneous System Information
      • 15.1.8. Miscellaneous Functions
    • 15.2. io — Core tools for working with streams
      • 15.2.1. Overview
        • 15.2.1.1. Text I/O
        • 15.2.1.2. Binary I/O
        • 15.2.1.3. Raw I/O
      • 15.2.2. High-level Module Interface
        • 15.2.2.1. In-memory streams
      • 15.2.3. Class hierarchy
        • 15.2.3.1. I/O Base Classes
        • 15.2.3.2. Raw File I/O
        • 15.2.3.3. Buffered Streams
        • 15.2.3.4. Text I/O
      • 15.2.4. Performance
        • 15.2.4.1. Binary I/O
        • 15.2.4.2. Text I/O
        • 15.2.4.3. Multi-threading
        • 15.2.4.4. Reentrancy
    • 15.3. time — Time access and conversions
    • 15.4. argparse — Parser for command-line options, arguments and sub-commands
      • 15.4.1. Example
        • 15.4.1.1. Creating a parser
        • 15.4.1.2. Adding arguments
        • 15.4.1.3. Parsing arguments
      • 15.4.2. ArgumentParser objects
        • 15.4.2.1. description
        • 15.4.2.2. epilog
        • 15.4.2.3. add_help
        • 15.4.2.4. prefix_chars
        • 15.4.2.5. fromfile_prefix_chars
        • 15.4.2.6. argument_default
        • 15.4.2.7. parents
        • 15.4.2.8. formatter_class
        • 15.4.2.9. conflict_handler
        • 15.4.2.10. prog
        • 15.4.2.11. usage
      • 15.4.3. The add_argument() method
        • 15.4.3.1. name or flags
        • 15.4.3.2. action
        • 15.4.3.3. nargs
        • 15.4.3.4. const
        • 15.4.3.5. default
        • 15.4.3.6. type
        • 15.4.3.7. choices
        • 15.4.3.8. required
        • 15.4.3.9. help
        • 15.4.3.10. metavar
        • 15.4.3.11. dest
      • 15.4.4. The parse_args() method
        • 15.4.4.1. Option value syntax
        • 15.4.4.2. Invalid arguments
        • 15.4.4.3. Arguments containing -
        • 15.4.4.4. Argument abbreviations
        • 15.4.4.5. Beyond sys.argv
        • 15.4.4.6. The Namespace object
      • 15.4.5. Other utilities
        • 15.4.5.1. Sub-commands
        • 15.4.5.2. FileType objects
        • 15.4.5.3. Argument groups
        • 15.4.5.4. Mutual exclusion
        • 15.4.5.5. Parser defaults
        • 15.4.5.6. Printing help
        • 15.4.5.7. Partial parsing
        • 15.4.5.8. Customizing file parsing
        • 15.4.5.9. Exiting methods
      • 15.4.6. Upgrading optparse code
    • 15.5. optparse — Parser for command line options
      • 15.5.1. Background
        • 15.5.1.1. Terminology
        • 15.5.1.2. What are options for?
        • 15.5.1.3. What are positional arguments for?
      • 15.5.2. Tutorial
        • 15.5.2.1. Understanding option actions
        • 15.5.2.2. The store action
        • 15.5.2.3. Handling boolean (flag) options
        • 15.5.2.4. Other actions
        • 15.5.2.5. Default values
        • 15.5.2.6. Generating help
          • 15.5.2.6.1. Grouping Options
        • 15.5.2.7. Printing a version string
        • 15.5.2.8. How optparse handles errors
        • 15.5.2.9. Putting it all together
      • 15.5.3. Reference Guide
        • 15.5.3.1. Creating the parser
        • 15.5.3.2. Populating the parser
        • 15.5.3.3. Defining options
        • 15.5.3.4. Option attributes
        • 15.5.3.5. Standard option actions
        • 15.5.3.6. Standard option types
        • 15.5.3.7. Parsing arguments
        • 15.5.3.8. Querying and manipulating your option parser
        • 15.5.3.9. Conflicts between options
        • 15.5.3.10. Cleanup
        • 15.5.3.11. Other methods
      • 15.5.4. Option Callbacks
        • 15.5.4.1. Defining a callback option
        • 15.5.4.2. How callbacks are called
        • 15.5.4.3. Raising errors in a callback
        • 15.5.4.4. Callback example 1: trivial callback
        • 15.5.4.5. Callback example 2: check option order
        • 15.5.4.6. Callback example 3: check option order (generalized)
        • 15.5.4.7. Callback example 4: check arbitrary condition
        • 15.5.4.8. Callback example 5: fixed arguments
        • 15.5.4.9. Callback example 6: variable arguments
      • 15.5.5. Extending optparse
        • 15.5.5.1. Adding new types
        • 15.5.5.2. Adding new actions
    • 15.6. getopt — C-style parser for command line options
    • 15.7. logging — Logging facility for Python
      • 15.7.1. Logger Objects
      • 15.7.2. Handler Objects
      • 15.7.3. Formatter Objects
      • 15.7.4. Filter Objects
      • 15.7.5. LogRecord Objects
      • 15.7.6. LogRecord attributes
      • 15.7.7. LoggerAdapter Objects
      • 15.7.8. Thread Safety
      • 15.7.9. Module-Level Functions
      • 15.7.10. Integration with the warnings module
    • 15.8. logging.config — Logging configuration
      • 15.8.1. Configuration functions
      • 15.8.2. Configuration dictionary schema
        • 15.8.2.1. Dictionary Schema Details
        • 15.8.2.2. Incremental Configuration
        • 15.8.2.3. Object connections
        • 15.8.2.4. User-defined objects
        • 15.8.2.5. Access to external objects
        • 15.8.2.6. Access to internal objects
        • 15.8.2.7. Import resolution and custom importers
      • 15.8.3. Configuration file format
    • 15.9. logging.handlers — Logging handlers
      • 15.9.1. StreamHandler
      • 15.9.2. FileHandler
      • 15.9.3. NullHandler
      • 15.9.4. WatchedFileHandler
      • 15.9.5. RotatingFileHandler
      • 15.9.6. TimedRotatingFileHandler
      • 15.9.7. SocketHandler
      • 15.9.8. DatagramHandler
      • 15.9.9. SysLogHandler
      • 15.9.10. NTEventLogHandler
      • 15.9.11. SMTPHandler
      • 15.9.12. MemoryHandler
      • 15.9.13. HTTPHandler
      • 15.9.14. QueueHandler
      • 15.9.15. QueueListener
    • 15.10. getpass — Portable password input
    • 15.11. curses — Terminal handling for character-cell displays
      • 15.11.1. Functions
      • 15.11.2. Window Objects
      • 15.11.3. Constants
    • 15.12. curses.textpad — Text input widget for curses programs
      • 15.12.1. Textbox objects
    • 15.13. curses.ascii — Utilities for ASCII characters
    • 15.14. curses.panel — A panel stack extension for curses
      • 15.14.1. Functions
      • 15.14.2. Panel Objects
    • 15.15. platform — Access to underlying platform’s identifying data
      • 15.15.1. Cross Platform
      • 15.15.2. Java Platform
      • 15.15.3. Windows Platform
        • 15.15.3.1. Win95/98 specific
      • 15.15.4. Mac OS Platform
      • 15.15.5. Unix Platforms
    • 15.16. errno — Standard errno system symbols
    • 15.17. ctypes — A foreign function library for Python
      • 15.17.1. ctypes tutorial
        • 15.17.1.1. Loading dynamic link libraries
        • 15.17.1.2. Accessing functions from loaded dlls
        • 15.17.1.3. Calling functions
        • 15.17.1.4. Fundamental data types
        • 15.17.1.5. Calling functions, continued
        • 15.17.1.6. Calling functions with your own custom data types
        • 15.17.1.7. Specifying the required argument types (function prototypes)
        • 15.17.1.8. Return types
        • 15.17.1.9. Passing pointers (or: passing parameters by reference)
        • 15.17.1.10. Structures and unions
        • 15.17.1.11. Structure/union alignment and byte order
        • 15.17.1.12. Bit fields in structures and unions
        • 15.17.1.13. Arrays
        • 15.17.1.14. Pointers
        • 15.17.1.15. Type conversions
        • 15.17.1.16. Incomplete Types
        • 15.17.1.17. Callback functions
        • 15.17.1.18. Accessing values exported from dlls
        • 15.17.1.19. Surprises
        • 15.17.1.20. Variable-sized data types
      • 15.17.2. ctypes reference
        • 15.17.2.1. Finding shared libraries
        • 15.17.2.2. Loading shared libraries
        • 15.17.2.3. Foreign functions
        • 15.17.2.4. Function prototypes
        • 15.17.2.5. Utility functions
        • 15.17.2.6. Data types
        • 15.17.2.7. Fundamental data types
        • 15.17.2.8. Structured data types
        • 15.17.2.9. Arrays and pointers
  • 16. Optional Operating System Services
    • 16.1. select — Waiting for I/O completion
      • 16.1.1. Edge and Level Trigger Polling (epoll) Objects
      • 16.1.2. Polling Objects
      • 16.1.3. Kqueue Objects
      • 16.1.4. Kevent Objects
    • 16.2. threading — Thread-based parallelism
      • 16.2.1. Thread Objects
      • 16.2.2. Lock Objects
      • 16.2.3. RLock Objects
      • 16.2.4. Condition Objects
        • 16.2.4.1. Usage
        • 16.2.4.2. Interface
      • 16.2.5. Semaphore Objects
        • 16.2.5.1. Semaphore Example
      • 16.2.6. Event Objects
      • 16.2.7. Timer Objects
      • 16.2.8. Barrier Objects
      • 16.2.9. Using locks, conditions, and semaphores in the with statement
      • 16.2.10. Importing in threaded code
    • 16.3. multiprocessing — Process-based parallelism
      • 16.3.1. Introduction
        • 16.3.1.1. The Process class
        • 16.3.1.2. Exchanging objects between processes
        • 16.3.1.3. Synchronization between processes
        • 16.3.1.4. Sharing state between processes
        • 16.3.1.5. Using a pool of workers
      • 16.3.2. Reference
        • 16.3.2.1. Process and exceptions
        • 16.3.2.2. Pipes and Queues
        • 16.3.2.3. Miscellaneous
        • 16.3.2.4. Connection Objects
        • 16.3.2.5. Synchronization primitives
        • 16.3.2.6. Shared ctypes Objects
          • 16.3.2.6.1. The multiprocessing.sharedctypes module
        • 16.3.2.7. Managers
          • 16.3.2.7.1. Namespace objects
          • 16.3.2.7.2. Customized managers
          • 16.3.2.7.3. Using a remote manager
        • 16.3.2.8. Proxy Objects
          • 16.3.2.8.1. Cleanup
        • 16.3.2.9. Process Pools
        • 16.3.2.10. Listeners and Clients
          • 16.3.2.10.1. Address Formats
        • 16.3.2.11. Authentication keys
        • 16.3.2.12. Logging
        • 16.3.2.13. The multiprocessing.dummy module
      • 16.3.3. Programming guidelines
        • 16.3.3.1. All platforms
        • 16.3.3.2. Windows
      • 16.3.4. Examples
    • 16.4. concurrent.futures — Launching parallel tasks
      • 16.4.1. Executor Objects
      • 16.4.2. ThreadPoolExecutor
        • 16.4.2.1. ThreadPoolExecutor Example
      • 16.4.3. ProcessPoolExecutor
        • 16.4.3.1. ProcessPoolExecutor Example
      • 16.4.4. Future Objects
      • 16.4.5. Module Functions
    • 16.5. mmap — Memory-mapped file support
    • 16.6. readline — GNU readline interface
      • 16.6.1. Example
    • 16.7. rlcompleter — Completion function for GNU readline
      • 16.7.1. Completer Objects
    • 16.8. dummy_threading — Drop-in replacement for the threading module
    • 16.9. _thread — Low-level threading API
    • 16.10. _dummy_thread — Drop-in replacement for the _thread module
  • 17. Interprocess Communication and Networking
    • 17.1. subprocess — Subprocess management
      • 17.1.1. Using the subprocess Module
        • 17.1.1.1. Frequently Used Arguments
        • 17.1.1.2. Popen Constructor
        • 17.1.1.3. Exceptions
        • 17.1.1.4. Security
      • 17.1.2. Popen Objects
      • 17.1.3. Windows Popen Helpers
        • 17.1.3.1. Constants
      • 17.1.4. Replacing Older Functions with the subprocess Module
        • 17.1.4.1. Replacing /bin/sh shell backquote
        • 17.1.4.2. Replacing shell pipeline
        • 17.1.4.3. Replacing os.system()
        • 17.1.4.4. Replacing the os.spawn family
        • 17.1.4.5. Replacing os.popen(), os.popen2(), os.popen3()
        • 17.1.4.6. Replacing functions from the popen2 module
      • 17.1.5. Legacy Shell Invocation Functions
      • 17.1.6. Notes
        • 17.1.6.1. Converting an argument sequence to a string on Windows
    • 17.2. socket — Low-level networking interface
      • 17.2.1. Socket families
      • 17.2.2. Module contents
      • 17.2.3. Socket Objects
      • 17.2.4. Notes on socket timeouts
        • 17.2.4.1. Timeouts and the connect method
        • 17.2.4.2. Timeouts and the accept method
      • 17.2.5. Example
    • 17.3. ssl — TLS/SSL wrapper for socket objects
      • 17.3.1. Functions, Constants, and Exceptions
        • 17.3.1.1. Socket creation
        • 17.3.1.2. Random generation
        • 17.3.1.3. Certificate handling
        • 17.3.1.4. Constants
      • 17.3.2. SSL Sockets
      • 17.3.3. SSL Contexts
      • 17.3.4. Certificates
        • 17.3.4.1. Certificate chains
        • 17.3.4.2. CA certificates
        • 17.3.4.3. Combined key and certificate
        • 17.3.4.4. Self-signed certificates
      • 17.3.5. Examples
        • 17.3.5.1. Testing for SSL support
        • 17.3.5.2. Client-side operation
        • 17.3.5.3. Server-side operation
      • 17.3.6. Notes on non-blocking sockets
      • 17.3.7. Security considerations
        • 17.3.7.1. Verifying certificates
        • 17.3.7.2. Protocol versions
        • 17.3.7.3. Cipher selection
    • 17.4. signal — Set handlers for asynchronous events
      • 17.4.1. General rules
        • 17.4.1.1. Execution of Python signal handlers
        • 17.4.1.2. Signals and threads
      • 17.4.2. Module contents
      • 17.4.3. Example
    • 17.5. asyncore — Asynchronous socket handler
      • 17.5.1. asyncore Example basic HTTP client
      • 17.5.2. asyncore Example basic echo server
    • 17.6. asynchat — Asynchronous socket command/response handler
      • 17.6.1. asynchat - Auxiliary Classes
      • 17.6.2. asynchat Example
  • 18. Internet Data Handling
    • 18.1. email — An email and MIME handling package
      • 18.1.1. email: Representing an email message
      • 18.1.2. email: Parsing email messages
        • 18.1.2.1. FeedParser API
        • 18.1.2.2. Parser class API
        • 18.1.2.3. Additional notes
      • 18.1.3. email: Generating MIME documents
      • 18.1.4. email: Creating email and MIME objects from scratch
      • 18.1.5. email: Internationalized headers
      • 18.1.6. email: Representing character sets
      • 18.1.7. email: Encoders
      • 18.1.8. email: Exception and Defect classes
      • 18.1.9. email: Miscellaneous utilities
      • 18.1.10. email: Iterators
      • 18.1.11. email: Examples
      • 18.1.12. Package History
      • 18.1.13. Differences from mimelib
    • 18.2. json — JSON encoder and decoder
      • 18.2.1. Basic Usage
      • 18.2.2. Encoders and decoders
    • 18.3. mailcap — Mailcap file handling
    • 18.4. mailbox — Manipulate mailboxes in various formats
      • 18.4.1. Mailbox objects
        • 18.4.1.1. Maildir
        • 18.4.1.2. mbox
        • 18.4.1.3. MH
        • 18.4.1.4. Babyl
        • 18.4.1.5. MMDF
      • 18.4.2. Message objects
        • 18.4.2.1. MaildirMessage
        • 18.4.2.2. mboxMessage
        • 18.4.2.3. MHMessage
        • 18.4.2.4. BabylMessage
        • 18.4.2.5. MMDFMessage
      • 18.4.3. Exceptions
      • 18.4.4. Examples
    • 18.5. mimetypes — Map filenames to MIME types
      • 18.5.1. MimeTypes Objects
    • 18.6. base64 — RFC 3548: Base16, Base32, Base64 Data Encodings
    • 18.7. binhex — Encode and decode binhex4 files
      • 18.7.1. Notes
    • 18.8. binascii — Convert between binary and ASCII
    • 18.9. quopri — Encode and decode MIME quoted-printable data
    • 18.10. uu — Encode and decode uuencode files
  • 19. Structured Markup Processing Tools
    • 19.1. html — HyperText Markup Language support
    • 19.2. html.parser — Simple HTML and XHTML parser
      • 19.2.1. Example HTML Parser Application
      • 19.2.2. HTMLParser Methods
      • 19.2.3. Examples
    • 19.3. html.entities — Definitions of HTML general entities
    • 19.4. xml.etree.ElementTree — The ElementTree XML API
      • 19.4.1. Functions
      • 19.4.2. Element Objects
      • 19.4.3. ElementTree Objects
      • 19.4.4. QName Objects
      • 19.4.5. TreeBuilder Objects
      • 19.4.6. XMLParser Objects
    • 19.5. xml.dom — The Document Object Model API
      • 19.5.1. Module Contents
      • 19.5.2. Objects in the DOM
        • 19.5.2.1. DOMImplementation Objects
        • 19.5.2.2. Node Objects
        • 19.5.2.3. NodeList Objects
        • 19.5.2.4. DocumentType Objects
        • 19.5.2.5. Document Objects
        • 19.5.2.6. Element Objects
        • 19.5.2.7. Attr Objects
        • 19.5.2.8. NamedNodeMap Objects
        • 19.5.2.9. Comment Objects
        • 19.5.2.10. Text and CDATASection Objects
        • 19.5.2.11. ProcessingInstruction Objects
        • 19.5.2.12. Exceptions
      • 19.5.3. Conformance
        • 19.5.3.1. Type Mapping
        • 19.5.3.2. Accessor Methods
    • 19.6. xml.dom.minidom — Lightweight DOM implementation
      • 19.6.1. DOM Objects
      • 19.6.2. DOM Example
      • 19.6.3. minidom and the DOM standard
    • 19.7. xml.dom.pulldom — Support for building partial DOM trees
      • 19.7.1. DOMEventStream Objects
    • 19.8. xml.sax — Support for SAX2 parsers
      • 19.8.1. SAXException Objects
    • 19.9. xml.sax.handler — Base classes for SAX handlers
      • 19.9.1. ContentHandler Objects
      • 19.9.2. DTDHandler Objects
      • 19.9.3. EntityResolver Objects
      • 19.9.4. ErrorHandler Objects
    • 19.10. xml.sax.saxutils — SAX Utilities
    • 19.11. xml.sax.xmlreader — Interface for XML parsers
      • 19.11.1. XMLReader Objects
      • 19.11.2. IncrementalParser Objects
      • 19.11.3. Locator Objects
      • 19.11.4. InputSource Objects
      • 19.11.5. The Attributes Interface
      • 19.11.6. The AttributesNS Interface
    • 19.12. xml.parsers.expat — Fast XML parsing using Expat
      • 19.12.1. XMLParser Objects
      • 19.12.2. ExpatError Exceptions
      • 19.12.3. Example
      • 19.12.4. Content Model Descriptions
      • 19.12.5. Expat error constants
  • 20. Internet Protocols and Support
    • 20.1. webbrowser — Convenient Web-browser controller
      • 20.1.1. Browser Controller Objects
    • 20.2. cgi — Common Gateway Interface support
      • 20.2.1. Introduction
      • 20.2.2. Using the cgi module
      • 20.2.3. Higher Level Interface
      • 20.2.4. Functions
      • 20.2.5. Caring about security
      • 20.2.6. Installing your CGI script on a Unix system
      • 20.2.7. Testing your CGI script
      • 20.2.8. Debugging CGI scripts
      • 20.2.9. Common problems and solutions
    • 20.3. cgitb — Traceback manager for CGI scripts
    • 20.4. wsgiref — WSGI Utilities and Reference Implementation
      • 20.4.1. wsgiref.util – WSGI environment utilities
      • 20.4.2. wsgiref.headers – WSGI response header tools
      • 20.4.3. wsgiref.simple_server – a simple WSGI HTTP server
      • 20.4.4. wsgiref.validate — WSGI conformance checker
      • 20.4.5. wsgiref.handlers – server/gateway base classes
      • 20.4.6. Examples
    • 20.5. urllib.request — Extensible library for opening URLs
      • 20.5.1. Request Objects
      • 20.5.2. OpenerDirector Objects
      • 20.5.3. BaseHandler Objects
      • 20.5.4. HTTPRedirectHandler Objects
      • 20.5.5. HTTPCookieProcessor Objects
      • 20.5.6. ProxyHandler Objects
      • 20.5.7. HTTPPasswordMgr Objects
      • 20.5.8. AbstractBasicAuthHandler Objects
      • 20.5.9. HTTPBasicAuthHandler Objects
      • 20.5.10. ProxyBasicAuthHandler Objects
      • 20.5.11. AbstractDigestAuthHandler Objects
      • 20.5.12. HTTPDigestAuthHandler Objects
      • 20.5.13. ProxyDigestAuthHandler Objects
      • 20.5.14. HTTPHandler Objects
      • 20.5.15. HTTPSHandler Objects
      • 20.5.16. FileHandler Objects
      • 20.5.17. FTPHandler Objects
      • 20.5.18. CacheFTPHandler Objects
      • 20.5.19. UnknownHandler Objects
      • 20.5.20. HTTPErrorProcessor Objects
      • 20.5.21. Examples
      • 20.5.22. Legacy interface
      • 20.5.23. urllib.request Restrictions
    • 20.6. urllib.response — Response classes used by urllib
    • 20.7. urllib.parse — Parse URLs into components
      • 20.7.1. URL Parsing
      • 20.7.2. Parsing ASCII Encoded Bytes
      • 20.7.3. Structured Parse Results
      • 20.7.4. URL Quoting
    • 20.8. urllib.error — Exception classes raised by urllib.request
    • 20.9. urllib.robotparser — Parser for robots.txt
    • 20.10. http.client — HTTP protocol client
      • 20.10.1. HTTPConnection Objects
      • 20.10.2. HTTPResponse Objects
      • 20.10.3. Examples
      • 20.10.4. HTTPMessage Objects
    • 20.11. ftplib — FTP protocol client
      • 20.11.1. FTP Objects
      • 20.11.2. FTP_TLS Objects
    • 20.12. poplib — POP3 protocol client
      • 20.12.1. POP3 Objects
      • 20.12.2. POP3 Example
    • 20.13. imaplib — IMAP4 protocol client
      • 20.13.1. IMAP4 Objects
      • 20.13.2. IMAP4 Example
    • 20.14. nntplib — NNTP protocol client
      • 20.14.1. NNTP Objects
        • 20.14.1.1. Attributes
        • 20.14.1.2. Methods
      • 20.14.2. Utility functions
    • 20.15. smtplib — SMTP protocol client
      • 20.15.1. SMTP Objects
      • 20.15.2. SMTP Example
    • 20.16. smtpd — SMTP Server
      • 20.16.1. SMTPServer Objects
      • 20.16.2. DebuggingServer Objects
      • 20.16.3. PureProxy Objects
      • 20.16.4. MailmanProxy Objects
      • 20.16.5. SMTPChannel Objects
    • 20.17. telnetlib — Telnet client
      • 20.17.1. Telnet Objects
      • 20.17.2. Telnet Example
    • 20.18. uuid — UUID objects according to RFC 4122
      • 20.18.1. Example
    • 20.19. socketserver — A framework for network servers
      • 20.19.1. Server Creation Notes
      • 20.19.2. Server Objects
      • 20.19.3. RequestHandler Objects
      • 20.19.4. Examples
        • 20.19.4.1. socketserver.TCPServer Example
        • 20.19.4.2. socketserver.UDPServer Example
        • 20.19.4.3. Asynchronous Mixins
    • 20.20. http.server — HTTP servers
    • 20.21. http.cookies — HTTP state management
      • 20.21.1. Cookie Objects
      • 20.21.2. Morsel Objects
      • 20.21.3. Example
    • 20.22. http.cookiejar — Cookie handling for HTTP clients
      • 20.22.1. CookieJar and FileCookieJar Objects
      • 20.22.2. FileCookieJar subclasses and co-operation with web browsers
      • 20.22.3. CookiePolicy Objects
      • 20.22.4. DefaultCookiePolicy Objects
      • 20.22.5. Cookie Objects
      • 20.22.6. Examples
    • 20.23. xmlrpc.client — XML-RPC client access
      • 20.23.1. ServerProxy Objects
      • 20.23.2. DateTime Objects
      • 20.23.3. Binary Objects
      • 20.23.4. Fault Objects
      • 20.23.5. ProtocolError Objects
      • 20.23.6. MultiCall Objects
      • 20.23.7. Convenience Functions
      • 20.23.8. Example of Client Usage
      • 20.23.9. Example of Client and Server Usage
    • 20.24. xmlrpc.server — Basic XML-RPC servers
      • 20.24.1. SimpleXMLRPCServer Objects
        • 20.24.1.1. SimpleXMLRPCServer Example
      • 20.24.2. CGIXMLRPCRequestHandler
      • 20.24.3. Documenting XMLRPC server
      • 20.24.4. DocXMLRPCServer Objects
      • 20.24.5. DocCGIXMLRPCRequestHandler
  • 21. Multimedia Services
    • 21.1. audioop — Manipulate raw audio data
    • 21.2. aifc — Read and write AIFF and AIFC files
    • 21.3. sunau — Read and write Sun AU files
      • 21.3.1. AU_read Objects
      • 21.3.2. AU_write Objects
    • 21.4. wave — Read and write WAV files
      • 21.4.1. Wave_read Objects
      • 21.4.2. Wave_write Objects
    • 21.5. chunk — Read IFF chunked data
    • 21.6. colorsys — Conversions between color systems
    • 21.7. imghdr — Determine the type of an image
    • 21.8. sndhdr — Determine type of sound file
    • 21.9. ossaudiodev — Access to OSS-compatible audio devices
      • 21.9.1. Audio Device Objects
      • 21.9.2. Mixer Device Objects
  • 22. Internationalization
    • 22.1. gettext — Multilingual internationalization services
      • 22.1.1. GNU gettext API
      • 22.1.2. Class-based API
        • 22.1.2.1. The NullTranslations class
        • 22.1.2.2. The GNUTranslations class
        • 22.1.2.3. Solaris message catalog support
        • 22.1.2.4. The Catalog constructor
      • 22.1.3. Internationalizing your programs and modules
        • 22.1.3.1. Localizing your module
        • 22.1.3.2. Localizing your application
        • 22.1.3.3. Changing languages on the fly
        • 22.1.3.4. Deferred translations
      • 22.1.4. Acknowledgements
    • 22.2. locale — Internationalization services
      • 22.2.1. Background, details, hints, tips and caveats
      • 22.2.2. For extension writers and programs that embed Python
      • 22.2.3. Access to message catalogs
  • 23. Program Frameworks
    • 23.1. turtle — Turtle graphics
      • 23.1.1. Introduction
      • 23.1.2. Overview of available Turtle and Screen methods
        • 23.1.2.1. Turtle methods
        • 23.1.2.2. Methods of TurtleScreen/Screen
      • 23.1.3. Methods of RawTurtle/Turtle and corresponding functions
        • 23.1.3.1. Turtle motion
        • 23.1.3.2. Tell Turtle’s state
        • 23.1.3.3. Settings for measurement
        • 23.1.3.4. Pen control
          • 23.1.3.4.1. Drawing state
          • 23.1.3.4.2. Color control
          • 23.1.3.4.3. Filling
          • 23.1.3.4.4. More drawing control
        • 23.1.3.5. Turtle state
          • 23.1.3.5.1. Visibility
          • 23.1.3.5.2. Appearance
        • 23.1.3.6. Using events
        • 23.1.3.7. Special Turtle methods
        • 23.1.3.8. Compound shapes
      • 23.1.4. Methods of TurtleScreen/Screen and corresponding functions
        • 23.1.4.1. Window control
        • 23.1.4.2. Animation control
        • 23.1.4.3. Using screen events
        • 23.1.4.4. Input methods
        • 23.1.4.5. Settings and special methods
        • 23.1.4.6. Methods specific to Screen, not inherited from TurtleScreen
      • 23.1.5. Public classes
      • 23.1.6. Help and configuration
        • 23.1.6.1. How to use help
        • 23.1.6.2. Translation of docstrings into different languages
        • 23.1.6.3. How to configure Screen and Turtles
      • 23.1.7. Demo scripts
      • 23.1.8. Changes since Python 2.6
      • 23.1.9. Changes since Python 3.0
    • 23.2. cmd — Support for line-oriented command interpreters
      • 23.2.1. Cmd Objects
      • 23.2.2. Cmd Example
    • 23.3. shlex — Simple lexical analysis
      • 23.3.1. shlex Objects
      • 23.3.2. Parsing Rules
  • 24. Graphical User Interfaces with Tk
    • 24.1. tkinter — Python interface to Tcl/Tk
      • 24.1.1. Tkinter Modules
      • 24.1.2. Tkinter Life Preserver
        • 24.1.2.1. How To Use This Section
        • 24.1.2.2. A Simple Hello World Program
      • 24.1.3. A (Very) Quick Look at Tcl/Tk
      • 24.1.4. Mapping Basic Tk into Tkinter
      • 24.1.5. How Tk and Tkinter are Related
      • 24.1.6. Handy Reference
        • 24.1.6.1. Setting Options
        • 24.1.6.2. The Packer
        • 24.1.6.3. Packer Options
        • 24.1.6.4. Coupling Widget Variables
        • 24.1.6.5. The Window Manager
        • 24.1.6.6. Tk Option Data Types
        • 24.1.6.7. Bindings and Events
        • 24.1.6.8. The index Parameter
        • 24.1.6.9. Images
    • 24.2. tkinter.ttk — Tk themed widgets
      • 24.2.1. Using Ttk
      • 24.2.2. Ttk Widgets
      • 24.2.3. Widget
        • 24.2.3.1. Standard Options
        • 24.2.3.2. Scrollable Widget Options
        • 24.2.3.3. Label Options
        • 24.2.3.4. Compatibility Options
        • 24.2.3.5. Widget States
        • 24.2.3.6. ttk.Widget
      • 24.2.4. Combobox
        • 24.2.4.1. Options
        • 24.2.4.2. Virtual events
        • 24.2.4.3. ttk.Combobox
      • 24.2.5. Notebook
        • 24.2.5.1. Options
        • 24.2.5.2. Tab Options
        • 24.2.5.3. Tab Identifiers
        • 24.2.5.4. Virtual Events
        • 24.2.5.5. ttk.Notebook
      • 24.2.6. Progressbar
        • 24.2.6.1. Options
        • 24.2.6.2. ttk.Progressbar
      • 24.2.7. Separator
        • 24.2.7.1. Options
      • 24.2.8. Sizegrip
        • 24.2.8.1. Platform-specific notes
        • 24.2.8.2. Bugs
      • 24.2.9. Treeview
        • 24.2.9.1. Options
        • 24.2.9.2. Item Options
        • 24.2.9.3. Tag Options
        • 24.2.9.4. Column Identifiers
        • 24.2.9.5. Virtual Events
        • 24.2.9.6. ttk.Treeview
      • 24.2.10. Ttk Styling
        • 24.2.10.1. Layouts
    • 24.3. tkinter.tix — Extension widgets for Tk
      • 24.3.1. Using Tix
      • 24.3.2. Tix Widgets
        • 24.3.2.1. Basic Widgets
        • 24.3.2.2. File Selectors
        • 24.3.2.3. Hierarchical ListBox
        • 24.3.2.4. Tabular ListBox
        • 24.3.2.5. Manager Widgets
        • 24.3.2.6. Image Types
        • 24.3.2.7. Miscellaneous Widgets
        • 24.3.2.8. Form Geometry Manager
      • 24.3.3. Tix Commands
    • 24.4. tkinter.scrolledtext — Scrolled Text Widget
    • 24.5. IDLE
      • 24.5.1. Menus
        • 24.5.1.1. File menu
        • 24.5.1.2. Edit menu
        • 24.5.1.3. Windows menu
        • 24.5.1.4. Debug menu (in the Python Shell window only)
      • 24.5.2. Basic editing and navigation
        • 24.5.2.1. Automatic indentation
        • 24.5.2.2. Python Shell window
      • 24.5.3. Syntax colors
      • 24.5.4. Startup
        • 24.5.4.1. Command line usage
    • 24.6. Other Graphical User Interface Packages
  • 25. Development Tools
    • 25.1. pydoc — Documentation generator and online help system
    • 25.2. doctest — Test interactive Python examples
      • 25.2.1. Simple Usage: Checking Examples in Docstrings
      • 25.2.2. Simple Usage: Checking Examples in a Text File
      • 25.2.3. How It Works
        • 25.2.3.1. Which Docstrings Are Examined?
        • 25.2.3.2. How are Docstring Examples Recognized?
        • 25.2.3.3. What’s the Execution Context?
        • 25.2.3.4. What About Exceptions?
        • 25.2.3.5. Option Flags and Directives
        • 25.2.3.6. Warnings
      • 25.2.4. Basic API
      • 25.2.5. Unittest API
      • 25.2.6. Advanced API
        • 25.2.6.1. DocTest Objects
        • 25.2.6.2. Example Objects
        • 25.2.6.3. DocTestFinder objects
        • 25.2.6.4. DocTestParser objects
        • 25.2.6.5. DocTestRunner objects
        • 25.2.6.6. OutputChecker objects
      • 25.2.7. Debugging
      • 25.2.8. Soapbox
    • 25.3. unittest — Unit testing framework
      • 25.3.1. Basic example
      • 25.3.2. Command-Line Interface
        • 25.3.2.1. Command-line options
      • 25.3.3. Test Discovery
      • 25.3.4. Organizing test code
      • 25.3.5. Re-using old test code
      • 25.3.6. Skipping tests and expected failures
      • 25.3.7. Classes and functions
        • 25.3.7.1. Test cases
          • 25.3.7.1.1. Deprecated aliases
        • 25.3.7.2. Grouping tests
        • 25.3.7.3. Loading and running tests
          • 25.3.7.3.1. load_tests Protocol
      • 25.3.8. Class and Module Fixtures
        • 25.3.8.1. setUpClass and tearDownClass
        • 25.3.8.2. setUpModule and tearDownModule
      • 25.3.9. Signal Handling
    • 25.4. 2to3 - Automated Python 2 to 3 code translation
      • 25.4.1. Using 2to3
      • 25.4.2. Fixers
      • 25.4.3. lib2to3 - 2to3’s library
    • 25.5. test — Regression tests package for Python
      • 25.5.1. Writing Unit Tests for the test package
      • 25.5.2. Running tests using the command-line interface
    • 25.6. test.support — Utilities for the Python test suite
  • 26. Debugging and Profiling
    • 26.1. bdb — Debugger framework
    • 26.2. pdb — The Python Debugger
      • 26.2.1. Debugger Commands
    • 26.3. The Python Profilers
      • 26.3.1. Introduction to the profilers
      • 26.3.2. Instant User’s Manual
      • 26.3.3. What Is Deterministic Profiling?
      • 26.3.4. Reference Manual – profile and cProfile
        • 26.3.4.1. The Stats Class
      • 26.3.5. Limitations
      • 26.3.6. Calibration
      • 26.3.7. Extensions — Deriving Better Profilers
    • 26.4. timeit — Measure execution time of small code snippets
      • 26.4.1. Command Line Interface
      • 26.4.2. Examples
    • 26.5. trace — Trace or track Python statement execution
      • 26.5.1. Command-Line Usage
        • 26.5.1.1. Main options
        • 26.5.1.2. Modifiers
        • 26.5.1.3. Filters
      • 26.5.2. Programmatic Interface
  • 27. Python Runtime Services
    • 27.1. sys — System-specific parameters and functions
    • 27.2. sysconfig — Provide access to Python’s configuration information
      • 27.2.1. Configuration variables
      • 27.2.2. Installation paths
      • 27.2.3. Other functions
      • 27.2.4. Using sysconfig as a script
    • 27.3. builtins — Built-in objects
    • 27.4. __main__ — Top-level script environment
    • 27.5. warnings — Warning control
      • 27.5.1. Warning Categories
      • 27.5.2. The Warnings Filter
        • 27.5.2.1. Default Warning Filters
      • 27.5.3. Temporarily Suppressing Warnings
      • 27.5.4. Testing Warnings
      • 27.5.5. Updating Code For New Versions of Python
      • 27.5.6. Available Functions
      • 27.5.7. Available Context Managers
    • 27.6. contextlib — Utilities for with-statement contexts
    • 27.7. abc — Abstract Base Classes
    • 27.8. atexit — Exit handlers
      • 27.8.1. atexit Example
    • 27.9. traceback — Print or retrieve a stack traceback
      • 27.9.1. Traceback Examples
    • 27.10. __future__ — Future statement definitions
    • 27.11. gc — Garbage Collector interface
    • 27.12. inspect — Inspect live objects
      • 27.12.1. Types and members
      • 27.12.2. Retrieving source code
      • 27.12.3. Classes and functions
      • 27.12.4. The interpreter stack
      • 27.12.5. Fetching attributes statically
      • 27.12.6. Current State of a Generator
    • 27.13. site — Site-specific configuration hook
    • 27.14. fpectl — Floating point exception control
      • 27.14.1. Example
      • 27.14.2. Limitations and other considerations
    • 27.15. distutils — Building and installing Python modules
  • 28. Custom Python Interpreters
    • 28.1. code — Interpreter base classes
      • 28.1.1. Interactive Interpreter Objects
      • 28.1.2. Interactive Console Objects
    • 28.2. codeop — Compile Python code
  • 29. Importing Modules
    • 29.1. imp — Access the import internals
      • 29.1.1. Examples
    • 29.2. zipimport — Import modules from Zip archives
      • 29.2.1. zipimporter Objects
      • 29.2.2. Examples
    • 29.3. pkgutil — Package extension utility
    • 29.4. modulefinder — Find modules used by a script
      • 29.4.1. Example usage of ModuleFinder
    • 29.5. runpy — Locating and executing Python modules
    • 29.6. importlib – An implementation of import
      • 29.6.1. Introduction
      • 29.6.2. Functions
      • 29.6.3. importlib.abc – Abstract base classes related to import
      • 29.6.4. importlib.machinery – Importers and path hooks
      • 29.6.5. importlib.util – Utility code for importers
  • 30. Python Language Services
    • 30.1. parser — Access Python parse trees
      • 30.1.1. Creating ST Objects
      • 30.1.2. Converting ST Objects
      • 30.1.3. Queries on ST Objects
      • 30.1.4. Exceptions and Error Handling
      • 30.1.5. ST Objects
      • 30.1.6. Example: Emulation of compile()
    • 30.2. ast — Abstract Syntax Trees
      • 30.2.1. Node classes
      • 30.2.2. Abstract Grammar
      • 30.2.3. ast Helpers
    • 30.3. symtable — Access to the compiler’s symbol tables
      • 30.3.1. Generating Symbol Tables
      • 30.3.2. Examining Symbol Tables
    • 30.4. symbol — Constants used with Python parse trees
    • 30.5. token — Constants used with Python parse trees
    • 30.6. keyword — Testing for Python keywords
    • 30.7. tokenize — Tokenizer for Python source
    • 30.8. tabnanny — Detection of ambiguous indentation
    • 30.9. pyclbr — Python class browser support
      • 30.9.1. Class Objects
      • 30.9.2. Function Objects
    • 30.10. py_compile — Compile Python source files
    • 30.11. compileall — Byte-compile Python libraries
      • 30.11.1. Command-line use
      • 30.11.2. Public functions
    • 30.12. dis — Disassembler for Python bytecode
      • 30.12.1. Python Bytecode Instructions
    • 30.13. pickletools — Tools for pickle developers
      • 30.13.1. Command line usage
        • 30.13.1.1. Command line options
      • 30.13.2. Programmatic Interface
  • 31. Miscellaneous Services
    • 31.1. formatter — Generic output formatting
      • 31.1.1. The Formatter Interface
      • 31.1.2. Formatter Implementations
      • 31.1.3. The Writer Interface
      • 31.1.4. Writer Implementations
  • 32. MS Windows Specific Services
    • 32.1. msilib — Read and write Microsoft Installer files
      • 32.1.1. Database Objects
      • 32.1.2. View Objects
      • 32.1.3. Summary Information Objects
      • 32.1.4. Record Objects
      • 32.1.5. Errors
      • 32.1.6. CAB Objects
      • 32.1.7. Directory Objects
      • 32.1.8. Features
      • 32.1.9. GUI classes
      • 32.1.10. Precomputed tables
    • 32.2. msvcrt – Useful routines from the MS VC++ runtime
      • 32.2.1. File Operations
      • 32.2.2. Console I/O
      • 32.2.3. Other Functions
    • 32.3. winreg – Windows registry access
      • 32.3.1. Constants
        • 32.3.1.1. HKEY_* Constants
        • 32.3.1.2. Access Rights
          • 32.3.1.2.1. 64-bit Specific
        • 32.3.1.3. Value Types
      • 32.3.2. Registry Handle Objects
    • 32.4. winsound — Sound-playing interface for Windows
  • 33. Unix Specific Services
    • 33.1. posix — The most common POSIX system calls
      • 33.1.1. Large File Support
      • 33.1.2. Notable Module Contents
    • 33.2. pwd — The password database
    • 33.3. spwd — The shadow password database
    • 33.4. grp — The group database
    • 33.5. crypt — Function to check Unix passwords
    • 33.6. termios — POSIX style tty control
      • 33.6.1. Example
    • 33.7. tty — Terminal control functions
    • 33.8. pty — Pseudo-terminal utilities
      • 33.8.1. Example
    • 33.9. fcntl — The fcntl() and ioctl() system calls
    • 33.10. pipes — Interface to shell pipelines
      • 33.10.1. Template Objects
    • 33.11. resource — Resource usage information
      • 33.11.1. Resource Limits
      • 33.11.2. Resource Usage
    • 33.12. nis — Interface to Sun’s NIS (Yellow Pages)
    • 33.13. syslog — Unix syslog library routines
      • 33.13.1. Examples
        • 33.13.1.1. Simple example
  • 34. Undocumented Modules
    • 34.1. Platform specific modules
• Extending and Embedding the Python Interpreter
  • 1. Extending Python with C or C++
    • 1.1. A Simple Example
    • 1.2. Intermezzo: Errors and Exceptions
    • 1.3. Back to the Example
    • 1.4. The Module’s Method Table and Initialization Function
    • 1.5. Compilation and Linkage
    • 1.6. Calling Python Functions from C
    • 1.7. Extracting Parameters in Extension Functions
    • 1.8. Keyword Parameters for Extension Functions
    • 1.9. Building Arbitrary Values
    • 1.10. Reference Counts
      • 1.10.1. Reference Counting in Python
      • 1.10.2. Ownership Rules
      • 1.10.3. Thin Ice
      • 1.10.4. NULL Pointers
    • 1.11. Writing Extensions in C++
    • 1.12. Providing a C API for an Extension Module
  • 2. Defining New Types
    • 2.1. The Basics
      • 2.1.1. Adding data and methods to the Basic example
      • 2.1.2. Providing finer control over data attributes
      • 2.1.3. Supporting cyclic garbage collection
      • 2.1.4. Subclassing other types
    • 2.2. Type Methods
      • 2.2.1. Finalization and De-allocation
      • 2.2.2. Object Presentation
      • 2.2.3. Attribute Management
        • 2.2.3.1. Generic Attribute Management
        • 2.2.3.2. Type-specific Attribute Management
      • 2.2.4. Object Comparison
      • 2.2.5. Abstract Protocol Support
      • 2.2.6. Weak Reference Support
      • 2.2.7. More Suggestions
  • 3. Building C and C++ Extensions with distutils
    • 3.1. Distributing your extension modules
  • 4. Building C and C++ Extensions on Windows
    • 4.1. A Cookbook Approach
    • 4.2. Differences Between Unix and Windows
    • 4.3. Using DLLs in Practice
  • 5. Embedding Python in Another Application
    • 5.1. Very High Level Embedding
    • 5.2. Beyond Very High Level Embedding: An overview
    • 5.3. Pure Embedding
    • 5.4. Extending Embedded Python
    • 5.5. Embedding Python in C++
    • 5.6. Compiling and Linking under Unix-like systems
• Python/C API Reference Manual
  • Introduction
    • Include Files
    • Objects, Types and Reference Counts
      • Reference Counts
        • Reference Count Details
      • Types
    • Exceptions
    • Embedding Python
    • Debugging Builds
  • The Very High Level Layer
  • Reference Counting
  • Exception Handling
    • Exception Objects
    • Unicode Exception Objects
    • Recursion Control
    • Standard Exceptions
  • Utilities
    • Operating System Utilities
    • System Functions
    • Process Control
    • Importing Modules
    • Data marshalling support
    • Parsing arguments and building values
      • Parsing arguments
        • Strings and buffers
        • Numbers
        • Other objects
        • API Functions
      • Building values
    • String conversion and formatting
    • Reflection
    • Codec registry and support functions
      • Codec lookup API
      • Registry API for Unicode encoding error handlers
  • Abstract Objects Layer
    • Object Protocol
    • Number Protocol
    • Sequence Protocol
    • Mapping Protocol
    • Iterator Protocol
    • Buffer Protocol
      • The buffer structure
      • Buffer-related functions
    • Old Buffer Protocol
  • Concrete Objects Layer
    • Fundamental Objects
      • Type Objects
      • The None Object
    • Numeric Objects
      • Integer Objects
      • Boolean Objects
      • Floating Point Objects
      • Complex Number Objects
        • Complex Numbers as C Structures
        • Complex Numbers as Python Objects
    • Sequence Objects
      • Bytes Objects
      • Byte Array Objects
        • Type check macros
        • Direct API functions
        • Macros
      • Unicode Objects and Codecs
        • Unicode Objects
          • Unicode Type
          • Unicode Character Properties
          • Plain Py_UNICODE
          • File System Encoding
          • wchar_t Support
        • Built-in Codecs
          • Generic Codecs
          • UTF-8 Codecs
          • UTF-32 Codecs
          • UTF-16 Codecs
          • UTF-7 Codecs
          • Unicode-Escape Codecs
          • Raw-Unicode-Escape Codecs
          • Latin-1 Codecs
          • ASCII Codecs
          • Character Map Codecs
          • MBCS codecs for Windows
          • Methods & Slots
        • Methods and Slot Functions
      • Tuple Objects
      • List Objects
    • Mapping Objects
      • Dictionary Objects
    • Other Objects
      • Set Objects
      • Function Objects
      • Instance Method Objects
      • Method Objects
      • File Objects
      • Module Objects
        • Initializing C modules
      • Iterator Objects
      • Descriptor Objects
      • Slice Objects
      • MemoryView objects
      • Weak Reference Objects
      • Capsules
      • Cell Objects
      • Generator Objects
      • DateTime Objects
      • Code Objects
  • Initialization, Finalization, and Threads
    • Initializing and finalizing the interpreter
    • Process-wide parameters
    • Thread State and the Global Interpreter Lock
      • Releasing the GIL from extension code
      • Non-Python created threads
      • High-level API
      • Low-level API
    • Sub-interpreter support
      • Bugs and caveats
    • Asynchronous Notifications
    • Profiling and Tracing
    • Advanced Debugger Support
  • Memory Management
    • Overview
    • Memory Interface
    • Examples
  • Object Implementation Support
    • Allocating Objects on the Heap
    • Common Object Structures
    • Type Objects
    • Number Object Structures
    • Mapping Object Structures
    • Sequence Object Structures
    • Buffer Object Structures
    • Supporting Cyclic Garbage Collection
• Distributing Python Modules
  • 1. An Introduction to Distutils
    • 1.1. Concepts & Terminology
    • 1.2. A Simple Example
    • 1.3. General Python terminology
    • 1.4. Distutils-specific terminology
  • 2. Writing the Setup Script
    • 2.1. Listing whole packages
    • 2.2. Listing individual modules
    • 2.3. Describing extension modules
      • 2.3.1. Extension names and packages
      • 2.3.2. Extension source files
      • 2.3.3. Preprocessor options
      • 2.3.4. Library options
      • 2.3.5. Other options
    • 2.4. Relationships between Distributions and Packages
    • 2.5. Installing Scripts
    • 2.6. Installing Package Data
    • 2.7. Installing Additional Files
    • 2.8. Additional meta-data
    • 2.9. Debugging the setup script
  • 3. Writing the Setup Configuration File
  • 4. Creating a Source Distribution
    • 4.1. Specifying the files to distribute
    • 4.2. Manifest-related options
  • 5. Creating Built Distributions
    • 5.1. Creating RPM packages
    • 5.2. Creating Windows Installers
    • 5.3. Cross-compiling on Windows
      • 5.3.1. The Postinstallation script
    • 5.4. Vista User Access Control (UAC)
  • 6. Registering with the Package Index
    • 6.1. The .pypirc file
  • 7. Uploading Packages to the Package Index
    • 7.1. PyPI package display
  • 8. Examples
    • 8.1. Pure Python distribution (by module)
    • 8.2. Pure Python distribution (by package)
    • 8.3. Single extension module
    • 8.4. Checking a package
  • 9. Extending Distutils
    • 9.1. Integrating new commands
    • 9.2. Adding new distribution types
  • 10. Command Reference
    • 10.1. Installing modules: the install command family
      • 10.1.1. install_data
      • 10.1.2. install_scripts
    • 10.2. Creating a source distribution: the sdist command
  • 11. API Reference
    • 11.1. distutils.core — Core Distutils functionality
    • 11.2. distutils.ccompiler — CCompiler base class
    • 11.3. distutils.unixccompiler — Unix C Compiler
    • 11.4. distutils.msvccompiler — Microsoft Compiler
    • 11.5. distutils.bcppcompiler — Borland Compiler
    • 11.6. distutils.cygwincompiler — Cygwin Compiler
    • 11.7. distutils.emxccompiler — OS/2 EMX Compiler
    • 11.8. distutils.archive_util — Archiving utilities
    • 11.9. distutils.dep_util — Dependency checking
    • 11.10. distutils.dir_util — Directory tree operations
    • 11.11. distutils.file_util — Single file operations
    • 11.12. distutils.util — Miscellaneous other utility functions
    • 11.13. distutils.dist — The Distribution class
    • 11.14. distutils.extension — The Extension class
    • 11.15. distutils.debug — Distutils debug mode
    • 11.16. distutils.errors — Distutils exceptions
    • 11.17. distutils.fancy_getopt — Wrapper around the standard getopt module
    • 11.18. distutils.filelist — The FileList class
    • 11.19. distutils.log — Simple PEP 282-style logging
    • 11.20. distutils.spawn — Spawn a sub-process
    • 11.21. distutils.sysconfig — System configuration information
    • 11.22. distutils.text_file — The TextFile class
    • 11.23. distutils.version — Version number classes
    • 11.24. distutils.cmd — Abstract base class for Distutils commands
    • 11.25. Creating a new Distutils command
    • 11.26. distutils.command — Individual Distutils commands
    • 11.27. distutils.command.bdist — Build a binary installer
    • 11.28. distutils.command.bdist_packager — Abstract base class for packagers
    • 11.29. distutils.command.bdist_dumb — Build a “dumb” installer
    • 11.30. distutils.command.bdist_msi — Build a Microsoft Installer binary package
    • 11.31. distutils.command.bdist_rpm — Build a binary distribution as a Redhat RPM and SRPM
    • 11.32. distutils.command.bdist_wininst — Build a Windows installer
    • 11.33. distutils.command.sdist — Build a source distribution
    • 11.34. distutils.command.build — Build all files of a package
    • 11.35. distutils.command.build_clib — Build any C libraries in a package
    • 11.36. distutils.command.build_ext — Build any extensions in a package
    • 11.37. distutils.command.build_py — Build the .py/.pyc files of a package
    • 11.38. distutils.command.build_scripts — Build the scripts of a package
    • 11.39. distutils.command.clean — Clean a package build area
    • 11.40. distutils.command.config — Perform package configuration
    • 11.41. distutils.command.install — Install a package
    • 11.42. distutils.command.install_data — Install data files from a package
    • 11.43. distutils.command.install_headers — Install C/C++ header files from a package
    • 11.44. distutils.command.install_lib — Install library files from a package
    • 11.45. distutils.command.install_scripts — Install script files from a package
    • 11.46. distutils.command.register — Register a module with the Python Package Index
    • 11.47. distutils.command.check — Check the meta-data of a package
• Installing Python Modules
  • Introduction
    • Best case: trivial installation
    • The new standard: Distutils
  • Standard Build and Install
    • Platform variations
    • Splitting the job up
    • How building works
    • How installation works
  • Alternate Installation
    • Alternate installation: the user scheme
    • Alternate installation: the home scheme
    • Alternate installation: Unix (the prefix scheme)
    • Alternate installation: Windows (the prefix scheme)
  • Custom Installation
    • Modifying Python’s Search Path
  • Distutils Configuration Files
    • Location and names of config files
    • Syntax of config files
  • Building Extensions: Tips and Tricks
    • Tweaking compiler/linker flags
    • Using non-Microsoft compilers on Windows
      • Borland/CodeGear C++
      • GNU C / Cygwin / MinGW
        • Older Versions of Python and MinGW
• Python HOWTOs
  • Python Advocacy HOWTO
    • Reasons to Use Python
      • Programmability
      • Prototyping
      • Simplicity and Ease of Understanding
      • Java Integration
    • Arguments and Rebuttals
    • Useful Resources
  • Porting Python 2 Code to Python 3
    • Choosing a Strategy
      • Universal Bits of Advice
    • Python 3 and 3to2
    • Python 2 and 2to3
      • Support Python 2.7
      • Try to Support Python 2.6 and Newer Only
        • from __future__ import print_function
        • from __future__ import unicode_literals
        • Bytes literals
      • Supporting Python 2.5 and Newer Only
        • from __future__ import absolute_import
      • Handle Common “Gotchas”
        • from __future__ import division
        • Specify when opening a file as binary
        • Text files
        • Subclass object
        • Deal With the Bytes/String Dichotomy
          • Mark Up Python 2 String Literals
          • Decide what APIs Will Accept
          • Bytes / Unicode Comparison
        • Indexing bytes objects
        • __str__()/__unicode__()
        • Don’t Index on Exceptions
        • Don’t use __getslice__ & Friends
        • Updating doctests
        • Update map for imbalanced input sequences
      • Eliminate -3 Warnings
      • Run 2to3
        • Manually
        • During Installation
      • Verify & Test
    • Python 2/3 Compatible Source
      • Follow The Steps for Using 2to3
      • Use six
      • Capturing the Currently Raised Exception
    • Other Resources
  • Porting Extension Modules to Python 3
    • Conditional compilation
    • Changes to Object APIs
      • str/unicode Unification
      • long/int Unification
    • Module initialization and state
    • CObject replaced with Capsule
    • Other options
  • Curses Programming with Python
    • What is curses?
      • The Python curses module
    • Starting and ending a curses application
    • Windows and Pads
    • Displaying Text
      • Attributes and Color
    • User Input
    • For More Information
  • Descriptor HowTo Guide
    • Abstract
    • Definition and Introduction
    • Descriptor Protocol
    • Invoking Descriptors
    • Descriptor Example
    • Properties
    • Functions and Methods
    • Static Methods and Class Methods
  • Functional Programming HOWTO
    • Introduction
      • Formal provability
      • Modularity
      • Ease of debugging and testing
      • Composability
    • Iterators
      • Data Types That Support Iterators
    • Generator expressions and list comprehensions
    • Generators
      • Passing values into a generator
    • Built-in functions
    • The itertools module
      • Creating new iterators
      • Calling functions on elements
      • Selecting elements
      • Grouping elements
    • The functools module
      • The operator module
    • Small functions and the lambda expression
    • Revision History and Acknowledgements
    • References
      • General
      • Python-specific
      • Python documentation
  • Logging HOWTO
    • Basic Logging Tutorial
      • When to use logging
      • A simple example
      • Logging to a file
      • Logging from multiple modules
      • Logging variable data
      • Changing the format of displayed messages
      • Displaying the date/time in messages
      • Next Steps
    • Advanced Logging Tutorial
      • Loggers
      • Handlers
      • Formatters
      • Configuring Logging
      • What happens if no configuration is provided
      • Configuring Logging for a Library
    • Logging Levels
      • Custom Levels
    • Useful Handlers
    • Exceptions raised during logging
    • Using arbitrary objects as messages
    • Optimization
  • Logging Cookbook
    • Using logging in multiple modules
    • Multiple handlers and formatters
    • Logging to multiple destinations
    • Configuration server example
    • Dealing with handlers that block
    • Sending and receiving logging events across a network
    • Adding contextual information to your logging output
      • Using LoggerAdapters to impart contextual information
      • Using Filters to impart contextual information
    • Logging to a single file from multiple processes
    • Using file rotation
    • Use of alternative formatting styles
    • Customising LogRecord
    • Subclassing QueueHandler - a ZeroMQ example
    • Subclassing QueueListener - a ZeroMQ example
    • An example dictionary-based configuration
    • A more elaborate multiprocessing example
    • Inserting a BOM into messages sent to a SysLogHandler
  • Regular Expression HOWTO
    • Introduction
    • Simple Patterns
      • Matching Characters
      • Repeating Things
    • Using Regular Expressions
      • Compiling Regular Expressions
      • The Backslash Plague
      • Performing Matches
      • Module-Level Functions
      • Compilation Flags
    • More Pattern Power
      • More Metacharacters
      • Grouping
      • Non-capturing and Named Groups
      • Lookahead Assertions
    • Modifying Strings
      • Splitting Strings
      • Search and Replace
    • Common Problems
      • Use String Methods
      • match() versus search()
      • Greedy versus Non-Greedy
      • Using re.VERBOSE
    • Feedback
  • Socket Programming HOWTO
    • Sockets
      • History
    • Creating a Socket
      • IPC
    • Using a Socket
      • Binary Data
    • Disconnecting
      • When Sockets Die
    • Non-blocking Sockets
      • Performance
  • Sorting HOW TO
    • Sorting Basics
    • Key Functions
    • Operator Module Functions
    • Ascending and Descending
    • Sort Stability and Complex Sorts
    • The Old Way Using Decorate-Sort-Undecorate
    • The Old Way Using the cmp Parameter
    • Odd and Ends
  • Unicode HOWTO
    • Introduction to Unicode
      • History of Character Codes
      • Definitions
      • Encodings
      • References
    • Python’s Unicode Support
      • The String Type
      • Converting to Bytes
      • Unicode Literals in Python Source Code
      • Unicode Properties
      • References
    • Reading and Writing Unicode Data
      • Unicode filenames
      • Tips for Writing Unicode-aware Programs
      • References
    • Acknowledgements
  • HOWTO Fetch Internet Resources Using The urllib Package
    • Introduction
    • Fetching URLs
      • Data
      • Headers
    • Handling Exceptions
      • URLError
      • HTTPError
        • Error Codes
      • Wrapping it Up
        • Number 1
        • Number 2
    • info and geturl
    • Openers and Handlers
    • Basic Authentication
    • Proxies
    • Sockets and Layers
    • Footnotes
  • HOWTO Use Python in the web
    • The Low-Level View
      • Common Gateway Interface
        • Simple script for testing CGI
        • Setting up CGI on your own server
        • Common problems with CGI scripts
      • mod_python
      • FastCGI and SCGI
        • Setting up FastCGI
      • mod_wsgi
    • Step back: WSGI
      • WSGI Servers
      • Case study: MoinMoin
    • Model-View-Controller
    • Ingredients for Websites
      • Templates
      • Data persistence
    • Frameworks
      • Some notable frameworks
        • Django
        • TurboGears
        • Zope
        • Other notable frameworks
• Python Frequently Asked Questions
  • General Python FAQ
    • General Information
    • Python in the real world
  • Programming FAQ
    • General Questions
    • Core Language
    • Numbers and strings
    • Performance
    • Sequences (Tuples/Lists)
    • Dictionaries
    • Objects
    • Modules
  • Design and History FAQ
    • Why does Python use indentation for grouping of statements?
    • Why am I getting strange results with simple arithmetic operations?
    • Why are floating point calculations so inaccurate?
    • Why are Python strings immutable?
    • Why must ‘self’ be used explicitly in method definitions and calls?
    • Why can’t I use an assignment in an expression?
    • Why does Python use methods for some functionality (e.g. list.index()) but functions for other (e.g. len(list))?
    • Why is join() a string method instead of a list or tuple method?
    • How fast are exceptions?
    • Why isn’t there a switch or case statement in Python?
    • Can’t you emulate threads in the interpreter instead of relying on an OS-specific thread implementation?
    • Why can’t lambda forms contain statements?
    • Can Python be compiled to machine code, C or some other language?
    • How does Python manage memory?
    • Why doesn’t CPython use a more traditional garbage collection scheme?
    • Why isn’t all memory freed when CPython exits?
    • Why are there separate tuple and list data types?
    • How are lists implemented?
    • How are dictionaries implemented?
    • Why must dictionary keys be immutable?
    • Why doesn’t list.sort() return the sorted list?
    • How do you specify and enforce an interface spec in Python?
    • Why are default values shared between objects?
    • Why is there no goto?
    • Why can’t raw strings (r-strings) end with a backslash?
    • Why doesn’t Python have a “with” statement for attribute assignments?
    • Why are colons required for the if/while/def/class statements?
    • Why does Python allow commas at the end of lists and tuples?
  • Library and Extension FAQ
    • General Library Questions
    • Common tasks
    • Threads
    • Input and Output
    • Network/Internet Programming
    • Databases
    • Mathematics and Numerics
  • Extending/Embedding FAQ
    • Can I create my own functions in C?
    • Can I create my own functions in C++?
    • Writing C is hard; are there any alternatives?
    • How can I execute arbitrary Python statements from C?
    • How can I evaluate an arbitrary Python expression from C?
    • How do I extract C values from a Python object?
    • How do I use Py_BuildValue() to create a tuple of arbitrary length?
    • How do I call an object’s method from C?
    • How do I catch the output from PyErr_Print() (or anything that prints to stdout/stderr)?
    • How do I access a module written in Python from C?
    • How do I interface to C++ objects from Python?
    • I added a module using the Setup file and the make fails; why?
    • How do I debug an extension?
    • I want to compile a Python module on my Linux system, but some files are missing. Why?
    • What does “SystemError: _PyImport_FixupExtension: module yourmodule not loaded” mean?
    • How do I tell “incomplete input” from “invalid input”?
    • How do I find undefined g++ symbols __builtin_new or __pure_virtual?
    • Can I create an object class with some methods implemented in C and others in Python (e.g. through inheritance)?
    • When importing module X, why do I get “undefined symbol: PyUnicodeUCS2*”?
  • Python on Windows FAQ
    • How do I run a Python program under Windows?
    • How do I make Python scripts executable?
    • Why does Python sometimes take so long to start?
    • Where is Freeze for Windows?
    • Is a *.pyd file the same as a DLL?
    • How can I embed Python into a Windows application?
    • How do I use Python for CGI?
    • How do I keep editors from inserting tabs into my Python source?
    • How do I check for a keypress without blocking?
    • How do I emulate os.kill() in Windows?
    • Why does os.path.isdir() fail on NT shared directories?
    • cgi.py (or other CGI programming) doesn’t work sometimes on NT or win95!
    • Why doesn’t os.popen() work in PythonWin on NT?
    • Why doesn’t os.popen()/win32pipe.popen() work on Win9x?
    • PyRun_SimpleFile() crashes on Windows but not on Unix; why?
    • Importing _tkinter fails on Windows 95/98: why?
    • How do I extract the downloaded documentation on Windows?
    • Missing cw3215mt.dll (or missing cw3215.dll)
    • Warning about CTL3D32 version from installer
  • Graphic User Interface FAQ
    • General GUI Questions
    • What platform-independent GUI toolkits exist for Python?
    • What platform-specific GUI toolkits exist for Python?
    • Tkinter questions
  • “Why is Python Installed on my Computer?” FAQ
    • What is Python?
    • Why is Python installed on my machine?
    • Can I delete Python?
• Glossary
• About these documents
  • Contributors to the Python Documentation
• Reporting Bugs
  • Documentation bugs
  • Using the Python issue tracker
• Copyright
• History and License
  • History of the software
  • Terms and conditions for accessing or otherwise using Python
  • Licenses and Acknowledgements for Incorporated Software
    • Mersenne Twister
    • Sockets
    • Floating point exception control
    • Asynchronous socket services
    • Cookie management
    • Execution tracing
    • UUencode and UUdecode functions
    • XML Remote Procedure Calls
    • test_epoll
    • Select kqueue
    • strtod and dtoa
    • OpenSSL
    • expat
    • libffi
    • zlib