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# Global Module Index

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Z

| `__builtin__` | The module that provides the built-in namespace.
| `__future__` | Future statement definitions
| `__main__` | The environment where the top-level script is run.
| `_winreg` (Windows) | Routines and objects for manipulating the Windows registry.
| A |
| `abc` | Abstract base classes according to PEP 3119.
| `aepack` (Mac) | Deprecated: Conversion between Python variables and AppleEvent data containers.
| `aetools` (Mac) | Deprecated: Basic support for sending Apple Events
| `aetypes` (Mac) | Deprecated: Python representation of the Apple Event Object Model.
| `aifc` | Read and write audio files in AIFF or AIFC format.
| `al` (IRIX) | Deprecated: Audio functions on the SGI.
| `AL` (IRIX) | Deprecated: Constants used with the al module.
| `anydbm` | Generic interface to DBM-style database modules.
| `applesingle` (Mac) | Deprecated: Rudimentary decoder for AppleSingle format files.
| `argparse` | Command-line option and argument-parsing library.
| `array` | Space efficient arrays of uniformly typed numeric values.
| `ast` | Abstract Syntax Tree classes and manipulation.
| `asynchat` | Support for asynchronous command/response protocols.
| `asyncore` | A base class for developing asynchronous socket handling services.
| `atexit` | Register and execute cleanup functions.
| `audioop` | Manipulate raw audio data.
| `autoGIL` (Mac) | Deprecated: Global Interpreter Lock handling in event loops.
| B |
| `base64` | RFC 3548: Base16, Base32, Base64 Data Encodings
| `BaseHTTPServer` | Basic HTTP server (base class for SimpleHTTPServer and CGIHTTPServer).
| `Bastion` | Deprecated: Providing restricted access to objects.
| `bdb` | Debugger framework.
| `binascii` | Tools for converting between binary and various ASCII-encoded binary representations.
| `binhex` | Encode and decode files in binhex4 format.
| `bisect` | Array bisection algorithms for binary searching.
| `bsddb` | Interface to Berkeley DB database library
| `buildtools` (Mac) | Deprecated: Helper module for BuildApplet, BuildApplication and macfreeze.
| `bz2` | Interface to compression and decompression routines compatible with bzip2.
| C |
| `calendar` | Functions for working with calendars, including some emulation of the Unix cal program.
| `Carbon` |
| `Carbon.AE` (Mac) | Deprecated: Interface to the Apple Events toolbox.
| `Carbon.AH` (Mac) | Deprecated: Interface to the Apple Help manager.
| `Carbon.App` (Mac) | Deprecated: Interface to the Appearance Manager.
| `Carbon.Appearance` (Mac) | Deprecated: Constant definitions for the interface to the Appearance Manager.
| `Carbon.CarbonEvents` (Mac) | Deprecated: Constants for the interface to the Carbon Event Manager.
| `Carbon.CarbonEvt` (Mac) | Deprecated: Interface to the Carbon Event Manager.
| `Carbon.CF` (Mac) | Deprecated: Interface to the Core Foundation.
| `Carbon.CG` (Mac) | Deprecated: Interface to Core Graphics.
| `Carbon.Cm` (Mac) | Deprecated: Interface to the Component Manager.
| `Carbon.Components` (Mac) | Deprecated: Constants for the interface to the Component Manager.
| `Carbon.ControlAccessor` (Mac) | Deprecated: Accessor functions for the interface to the Control Manager.
| `Carbon.Controls` (Mac) | Deprecated: Constants for the interface to the Control Manager.
| `Carbon.CoreFounation` (Mac) | Deprecated: Constants for the interface to CoreFoundation.
| `Carbon.CoreGraphics` (Mac) | Deprecated: Constants for the interface to CoreGraphics.
| `Carbon.Ctl` (Mac) | Deprecated: Interface to the Control Manager.
| `Carbon.Dialogs` (Mac) | Deprecated: Constants for the interface to the Dialog Manager.
| `Carbon.Dlg` (Mac) | Deprecated: Interface to the Dialog Manager.
| `Carbon.Drag` (Mac) | Deprecated: Interface to the Drag and Drop Manager.
| `Carbon.Dragconst` (Mac) | Deprecated: Constants for the interface to the Drag and Drop Manager.
| `Carbon.Events` (Mac) | Deprecated: Constants for the interface to the classic Event Manager.
| `Carbon.Evt` (Mac) | Deprecated: Interface to the classic Event Manager.
| `Carbon.File` (Mac) | Deprecated: Interface to the File Manager.
| `Carbon.Files` (Mac) | Deprecated: Constants for the interface to the File Manager.
| `Carbon.Fm` (Mac) | Deprecated: Interface to the Font Manager.
| `Carbon.Folder` (Mac) | Deprecated: Interface to the Folder Manager.
| `Carbon.Folders` (Mac) | Deprecated: Constants for the interface to the Folder Manager.
| `Carbon.Fonts` (Mac) | Deprecated: Constants for the interface to the Font Manager.
| `Carbon.Help` (Mac) | Deprecated: Interface to the Carbon Help Manager.
| `Carbon.IBCarbon` (Mac) | Deprecated: Interface to the Carbon InterfaceBuilder support libraries.
| `Carbon.IBCarbonRuntime` (Mac) | Deprecated: Constants for the interface to the Carbon InterfaceBuilder support libraries.
| `Carbon.Icns` (Mac) | Deprecated: Interface to the Carbon Icon Manager
| `Carbon.Icons` (Mac) | Deprecated: Constants for the interface to the Carbon Icon Manager
| `Carbon.Launch` (Mac) | Deprecated: Interface to the Carbon Launch Services.
| `Carbon.LaunchServices` (Mac) | Deprecated: Constants for the interface to the Carbon Launch Services.
| `Carbon.List` (Mac) | Deprecated: Interface to the List Manager.
| `Carbon.Lists` (Mac) | Deprecated: Constants for the interface to the List Manager.
| `Carbon.MacHelp` (Mac) | Deprecated: Constants for the interface to the Carbon Help Manager.
| `Carbon.MediaDescr` (Mac) | Deprecated: Parsers and generators for Quicktime Media descriptors
| `Carbon.Menu` (Mac) | Deprecated: Interface to the Menu Manager.
| `Carbon.Menus` (Mac) | Deprecated: Constants for the interface to the Menu Manager.
| `Carbon.Mlte` (Mac) | Deprecated: Interface to the MultiLingual Text Editor.
| `Carbon.OSA` (Mac) | Deprecated: Interface to the Carbon OSA Library.
| `Carbon.OSAconst` (Mac) | Deprecated: Constants for the interface to the Carbon OSA Library.
| `Carbon.Qd` (Mac) | Deprecated: Interface to the QuickDraw toolbox.
| `Carbon.Qdoffs` (Mac) | Deprecated: Interface to the QuickDraw Offscreen APIs.
| `Carbon.QDOffscreen` (Mac) | Deprecated: Constants for the interface to the QuickDraw Offscreen APIs.
| `Carbon.Qt` (Mac) | Deprecated: Interface to the QuickTime toolbox.
| `Carbon.QuickDraw` (Mac) | Deprecated: Constants for the interface to the QuickDraw toolbox.
| `Carbon.QuickTime` (Mac) | Deprecated: Constants for the interface to the QuickTime toolbox.
| `Carbon.Res` (Mac) | Deprecated: Interface to the Resource Manager and Handles.
| `Carbon.Resources` (Mac) | Deprecated: Constants for the interface to the Resource Manager and Handles.
| `Carbon.Scrap` (Mac) | Deprecated: The Scrap Manager provides basic services for implementing cut & paste and clipboard operations.
| `Carbon.Snd` (Mac) | Deprecated: Interface to the Sound Manager.
| `Carbon.Sound` (Mac) | Deprecated: Constants for the interface to the Sound Manager.
| `Carbon.TE` (Mac) | Deprecated: Interface to TextEdit.
| `Carbon.TextEdit` (Mac) | Deprecated: Constants for the interface to TextEdit.
| `Carbon.Win` (Mac) | Deprecated: Interface to the Window Manager.
| `Carbon.Windows` (Mac) | Deprecated: Constants for the interface to the Window Manager.
| `cd` (IRIX) | Deprecated: Interface to the CD-ROM on Silicon Graphics systems.
| `cfmfile` (Mac) | Deprecated: Code Fragment Resource module.
| `cgi` | Helpers for running Python scripts via the Common Gateway Interface.
| `CGIHTTPServer` | This module provides a request handler for HTTP servers which can run CGI scripts.
| `cgitb` | Configurable traceback handler for CGI scripts.
| `chunk` | Module to read IFF chunks.
| `cmath` | Mathematical functions for complex numbers.
| `cmd` | Build line-oriented command interpreters.
| `code` | Facilities to implement read-eval-print loops.
| `codecs` | Encode and decode data and streams.
| `codeop` | Compile (possibly incomplete) Python code.
| `collections` | High-performance datatypes
| `ColorPicker` (Mac) | Deprecated: Interface to the standard color selection dialog.
| `colorsys` | Conversion functions between RGB and other color systems.
| `commands` (Unix) | Deprecated: Utility functions for running external commands.
| `compileall` | Tools for byte-compiling all Python source files in a directory tree.
| `compiler` | Deprecated: Python code compiler written in Python.
| `compiler.ast` |
| `compiler.visitor` |
| `ConfigParser` | Configuration file parser.
| `contextlib` | Utilities for with-statement contexts.
| `Cookie` | Support for HTTP state management (cookies).
| `cookielib` | Classes for automatic handling of HTTP cookies.
| `copy` | Shallow and deep copy operations.
| `copy_reg` | Register pickle support functions.
| `cPickle` | Faster version of pickle, but not subclassable.
| `cProfile` | Python profiler
| `crypt` (Unix) | The crypt() function used to check Unix passwords.
| `cStringIO` | Faster version of StringIO, but not subclassable.
| `csv` | Write and read tabular data to and from delimited files.
| `ctypes` | A foreign function library for Python.
| `curses` (Unix) | An interface to the curses library, providing portable terminal handling.
| `curses.ascii` | Constants and set-membership functions for ASCII characters.
| `curses.panel` | A panel stack extension that adds depth to curses windows.
| `curses.textpad` | Emacs-like input editing in a curses window.
| `curses.wrapper` | Terminal configuration wrapper for curses programs.
| D |
| `datetime` | Basic date and time types.
| `dbhash` | DBM-style interface to the BSD database library.
| `dbm` (Unix) | The standard "database" interface, based on ndbm.
| `decimal` | Implementation of the General Decimal Arithmetic Specification.
| `DEVICE` (IRIX) | Deprecated: Constants used with the gl module.
| `difflib` | Helpers for computing differences between objects.
| `dircache` | Deprecated: Return directory listing, with cache mechanism.
| `dis` | Disassembler for Python bytecode.
| `distutils` | Support for building and installing Python modules into an existing Python installation.
| `distutils.archive_util` | Utility functions for creating archive files (tarballs, zip files, ...)
| `distutils.bcppcompiler` |
| `distutils.ccompiler` | Abstract CCompiler class
| `distutils.cmd` | This module provides the abstract base class Command. This class is subclassed by the modules in the distutils.command subpackage.
| `distutils.command` | This subpackage contains one module for each standard Distutils command.
| `distutils.command.bdist` | Build a binary installer for a package
| `distutils.command.bdist_dumb` | Build a "dumb" installer - a simple archive of files
| `distutils.command.bdist_msi` | Build a binary distribution as a Windows MSI file
| `distutils.command.bdist_packager` | Abstract base class for packagers
| `distutils.command.bdist_rpm` | Build a binary distribution as a Redhat RPM and SRPM
| `distutils.command.bdist_wininst` | Build a Windows installer
| `distutils.command.build` | Build all files of a package
| `distutils.command.build_clib` | Build any C libraries in a package
| `distutils.command.build_ext` | Build any extensions in a package
| `distutils.command.build_py` | Build the .py/.pyc files of a package
| `distutils.command.build_scripts` | Build the scripts of a package
| `distutils.command.check` | Check the metadata of a package
| `distutils.command.clean` | Clean a package build area
| `distutils.command.config` | Perform package configuration
| `distutils.command.install` | Install a package
| `distutils.command.install_data` | Install data files from a package
| `distutils.command.install_headers` | Install C/C++ header files from a package
| `distutils.command.install_lib` | Install library files from a package
| `distutils.command.install_scripts` | Install script files from a package
| `distutils.command.register` | Register a module with the Python Package Index
| `distutils.command.sdist` | Build a source distribution
| `distutils.core` | The core Distutils functionality
| `distutils.cygwinccompiler` |
| `distutils.debug` | Provides the debug flag for distutils
| `distutils.dep_util` | Utility functions for simple dependency checking
| `distutils.dir_util` | Utility functions for operating on directories and directory trees
| `distutils.dist` | Provides the Distribution class, which represents the module distribution being built/installed/distributed
| `distutils.emxccompiler` | OS/2 EMX Compiler support
| `distutils.errors` | Provides standard distutils exceptions
| `distutils.extension` | Provides the Extension class, used to describe C/C++ extension modules in setup scripts
| `distutils.fancy_getopt` | Additional getopt functionality
| `distutils.file_util` | Utility functions for operating on single files
| `distutils.filelist` | The FileList class, used for poking about the file system and building lists of files.
| `distutils.log` | A simple logging mechanism, 282-style
| `distutils.msvccompiler` | Microsoft Compiler
| `distutils.spawn` | Provides the spawn() function
| `distutils.sysconfig` | Low-level access to configuration information of the Python interpreter.
| `distutils.text_file` | provides the TextFile class, a simple interface to text files
| `distutils.unixccompiler` | UNIX C Compiler
| `distutils.util` | Miscellaneous other utility functions
| `distutils.version` | implements classes that represent module version numbers.
| `dl` (Unix) | Deprecated: Call C functions in shared objects.
| `doctest` | Test pieces of code within docstrings.
| `DocXMLRPCServer` | Self-documenting XML-RPC server implementation.
| `dumbdbm` | Portable implementation of the simple DBM interface.
| `dummy_thread` | Drop-in replacement for the thread module.
| `dummy_threading` | Drop-in replacement for the threading module.
| E |
| `EasyDialogs` (Mac) | Deprecated: Basic Macintosh dialogs.
| `email` | Package supporting the parsing, manipulating, and generating email messages, including MIME documents.
| `email.charset` | Character Sets
| `email.encoders` | Encoders for email message payloads.
| `email.errors` | The exception classes used by the email package.
| `email.generator` | Generate flat text email messages from a message structure.
| `email.header` | Representing non-ASCII headers
| `email.iterators` | Iterate over a message object tree.
| `email.message` | The base class representing email messages.
| `email.mime` | Build MIME messages.
| `email.parser` | Parse flat text email messages to produce a message object structure.
| `email.utils` | Miscellaneous email package utilities.
| `encodings` |
| `encodings.idna` | Internationalized Domain Names implementation
| `encodings.utf_8_sig` | UTF-8 codec with BOM signature
| `errno` | Standard errno system symbols.
| `exceptions` | Standard exception classes.
| F |
| `fcntl` (Unix) | The fcntl() and ioctl() system calls.
| `filecmp` | Compare files efficiently.
| `fileinput` | Loop over standard input or a list of files.
| `findertools` (Mac) | Wrappers around the finder's Apple Events interface.
| `FL` (IRIX) | Deprecated: Constants used with the fl module.
| `fl` (IRIX) | Deprecated: FORMS library for applications with graphical user interfaces.
| `flp` (IRIX) | Deprecated: Functions for loading stored FORMS designs.
| `fm` (IRIX) | Deprecated: Font Manager interface for SGI workstations.
| `fnmatch` | Unix shell style filename pattern matching.
| `formatter` | Generic output formatter and device interface.
| `fpectl` (Unix) | Provide control for floating point exception handling.
| `fpformat` | Deprecated: General floating point formatting functions.
| `fractions` | Rational numbers.
| `FrameWork` (Mac) | Deprecated: Interactive application framework.
| `ftplib` | FTP protocol client (requires sockets).
| `functools` | Higher order functions and operations on callable objects.
| `future_builtins` |
| G |
| `gc` | Interface to the cycle-detecting garbage collector.
| `gdbm` (Unix) | GNU's reinterpretation of dbm.
| `gensuitemodule` (Mac) | Create a stub package from an OSA dictionary
| `getopt` | Portable parser for command line options; support both short and long option names.
| `getpass` | Portable reading of passwords and retrieval of the userid.
| `gettext` | Multilingual internationalization services.
| `gl` (IRIX) | Deprecated: Functions from the Silicon Graphics Graphics Library.
| `GL` (IRIX) | Deprecated: Constants used with the gl module.
| `glob` | Unix shell style pathname pattern expansion.
| `grp` (Unix) | The group database (getgrnam() and friends).
| `gzip` | Interfaces for gzip compression and decompression using file objects.
| H |
| `hashlib` | Secure hash and message digest algorithms.
| `heapq` | Heap queue algorithm (a.k.a. priority queue).
| `hmac` | Keyed-Hashing for Message Authentication (HMAC) implementation for Python.
| `hotshot` | High performance logging profiler, mostly written in C.
| `hotshot.stats` | Statistical analysis for Hotshot
| `htmlentitydefs` | Definitions of HTML general entities.
| `htmllib` | Deprecated: A parser for HTML documents.
| `HTMLParser` | A simple parser that can handle HTML and XHTML.
| `httplib` | HTTP and HTTPS protocol client (requires sockets).
| I |
| `ic` (Mac) | Deprecated: Access to the Mac OS X Internet Config.
| `icopen` (Mac) | Deprecated: Internet Config replacement for open().
| `imageop` | Deprecated: Manipulate raw image data.
| `imaplib` | IMAP4 protocol client (requires sockets).
| `imgfile` (IRIX) | Deprecated: Support for SGI imglib files.
| `imghdr` | Determine the type of image contained in a file or byte stream.
| `imp` | Access the implementation of the import statement.
| `importlib` | Convenience wrappers for __import__
| `imputil` | Deprecated: Manage and augment the import process.
| `inspect` | Extract information and source code from live objects.
| `io` | Core tools for working with streams.
| `itertools` | Functions creating iterators for efficient looping.
| J |
| `jpeg` (IRIX) | Deprecated: Read and write image files in compressed JPEG format.
| `json` | Encode and decode the JSON format.
| K |
| `keyword` | Test whether a string is a keyword in Python.
| L |
| `lib2to3` | the 2to3 library
| `linecache` | This module provides random access to individual lines from text files.
| `locale` | Internationalization services.
| `logging` | Flexible event logging system for applications.
| `logging.config` | Configuration of the logging module.
| `logging.handlers` | Handlers for the logging module.
| M |
| `macerrors` (Mac) | Deprecated: Constant definitions for many Mac OS error codes.
| `MacOS` (Mac) | Deprecated: Access to Mac OS-specific interpreter features.
| `macostools` (Mac) | Deprecated: Convenience routines for file manipulation.
| `macpath` | Mac OS 9 path manipulation functions.
| `macresource` (Mac) | Deprecated: Locate script resources.
| `mailbox` | Manipulate mailboxes in various formats
| `mailcap` | Mailcap file handling.
| `marshal` | Convert Python objects to streams of bytes and back (with different constraints).
| `math` | Mathematical functions (sin() etc.).
| `md5` | Deprecated: RSA's MD5 message digest algorithm.
| `mhlib` | Deprecated: Manipulate MH mailboxes from Python.
| `mimetools` | Deprecated: Tools for parsing MIME-style message bodies.
| `mimetypes` | Mapping of filename extensions to MIME types.
| `MimeWriter` | Deprecated: Write MIME format files.
| `mimify` | Deprecated: Mimification and unmimification of mail messages.
| `MiniAEFrame` (Mac) | Support to act as an Open Scripting Architecture (OSA) server ("Apple Events").
| `mmap` | Interface to memory-mapped files for Unix and Windows.
| `modulefinder` | Find modules used by a script.
| `msilib` (Windows) | Creation of Microsoft Installer files, and CAB files.
| `msvcrt` (Windows) | Miscellaneous useful routines from the MS VC++ runtime.
| `multifile` | Deprecated: Support for reading files which contain distinct parts, such as some MIME data.
| `multiprocessing` | Process-based "threading" interface.
| `multiprocessing.connection` | API for dealing with sockets.
| `multiprocessing.dummy` | Dumb wrapper around threading.
| `multiprocessing.managers` | Share data between process with shared objects.
| `multiprocessing.pool` | Create pools of processes.
| `multiprocessing.sharedctypes` | Allocate ctypes objects from shared memory.
| `mutex` | Deprecated: Lock and queue for mutual exclusion.
| N |
| `Nav` (Mac) | Deprecated: Interface to Navigation Services.
| `netrc` | Loading of .netrc files.
| `new` | Deprecated: Interface to the creation of runtime implementation objects.
| `nis` (Unix) | Interface to Sun's NIS (Yellow Pages) library.
| `nntplib` | NNTP protocol client (requires sockets).
| `numbers` | Numeric abstract base classes (Complex, Real, Integral, etc.).
| O |
| `operator` | Functions corresponding to the standard operators.
| `optparse` | Deprecated: Command-line option parsing library.
| `os` | Miscellaneous operating system interfaces.
| `os.path` | Operations on pathnames.
| `ossaudiodev` (Linux, FreeBSD) | Access to OSS-compatible audio devices.
| P |
| `parser` | Access parse trees for Python source code.
| `pdb` | The Python debugger for interactive interpreters.
| `pickle` | Convert Python objects to streams of bytes and back.
| `pickletools` | Contains extensive comments about the pickle protocols and pickle-machine opcodes, as well as some useful functions.
| `pipes` (Unix) | A Python interface to Unix shell pipelines.
| `PixMapWrapper` (Mac) | Deprecated: Wrapper for PixMap objects.
| `pkgutil` | Utilities for the import system.
| `platform` | Retrieves as much platform identifying data as possible.
| `plistlib` | Generate and parse Mac OS X plist files.
| `popen2` | Deprecated: Subprocesses with accessible standard I/O streams.
| `poplib` | POP3 protocol client (requires sockets).
| `posix` (Unix) | The most common POSIX system calls (normally used via module os).
| `posixfile` (Unix) | Deprecated: A file-like object with support for locking.
| `pprint` | Data pretty printer.
| `profile` | Python source profiler.
| `pstats` | Statistics object for use with the profiler.
| `pty` (Linux) | Pseudo-Terminal Handling for Linux.
| `pwd` (Unix) | The password database (getpwnam() and friends).
| `py_compile` | Generate byte-code files from Python source files.
| `pyclbr` | Supports information extraction for a Python class browser.
| `pydoc` | Documentation generator and online help system.
| Q |
| `Queue` | A synchronized queue class.
| `quopri` | Encode and decode files using the MIME quoted-printable encoding.
| R |
| `random` | Generate pseudo-random numbers with various common distributions.
| `re` | Regular expression operations.
| `readline` (Unix) | GNU readline support for Python.
| `repr` | Alternate repr() implementation with size limits.
| `resource` (Unix) | An interface to provide resource usage information on the current process.
| `rexec` | Deprecated: Basic restricted execution framework.
| `rfc822` | Deprecated: Parse 2822 style mail messages.
| `rlcompleter` | Python identifier completion, suitable for the GNU readline library.
| `robotparser` | Loads a robots.txt file and answers questions about fetchability of other URLs.
| `runpy` | Locate and run Python modules without importing them first.
| S |
| `sched` | General purpose event scheduler.
| `ScrolledText` (Tk) | Text widget with a vertical scroll bar.
| `select` | Wait for I/O completion on multiple streams.
| `sets` | Deprecated: Implementation of sets of unique elements.
| `sgmllib` | Deprecated: Only as much of an SGML parser as needed to parse HTML.
| `sha` | Deprecated: NIST's secure hash algorithm, SHA.
| `shelve` | Python object persistence.
| `shlex` | Simple lexical analysis for Unix shell-like languages.
| `shutil` | High-level file operations, including copying.
| `signal` | Set handlers for asynchronous events.
| `SimpleHTTPServer` | This module provides a basic request handler for HTTP servers.
| `SimpleXMLRPCServer` | Basic XML-RPC server implementation.
| `site` | A standard way to reference site-specific modules.
| `smtpd` | A SMTP server implementation in Python.
| `smtplib` | SMTP protocol client (requires sockets).
| `sndhdr` | Determine type of a sound file.
| `socket` | Low-level networking interface.
| `SocketServer` | A framework for network servers.
| `spwd` (Unix) | The shadow password database (getspnam() and friends).
| `sqlite3` | A DB-API 2.0 implementation using SQLite 3.x.
| `ssl` | TLS/SSL wrapper for socket objects
| `stat` | Utilities for interpreting the results of os.stat(), os.lstat() and os.fstat().
| `statvfs` | Deprecated: Constants for interpreting the result of os.statvfs().
| `string` | Common string operations.
| `StringIO` | Read and write strings as if they were files.
| `stringprep` | Deprecated: String preparation, as per RFC 3453
| `struct` | Interpret strings as packed binary data.
| `subprocess` | Subprocess management.
| `sunau` | Provide an interface to the Sun AU sound format.
| `sunaudiodev` (SunOS) | Deprecated: Access to Sun audio hardware.
| `SUNAUDIODEV` (SunOS) | Deprecated: Constants for use with sunaudiodev.
| `symbol` | Constants representing internal nodes of the parse tree.
| `symtable` | Interface to the compiler's internal symbol tables.
| `sys` | Access system-specific parameters and functions.
| `sysconfig` | Python's configuration information
| `syslog` (Unix) | An interface to the Unix syslog library routines.
| T |
| `tabnanny` | Tool for detecting white space related problems in Python source files in a directory tree.
| `tarfile` | Read and write tar-format archive files.
| `telnetlib` | Telnet client class.
| `tempfile` | Generate temporary files and directories.
| `termios` (Unix) | POSIX style tty control.
| `test` | Regression tests package containing the testing suite for Python.
| `test.test_support` | Support for Python regression tests.
| `textwrap` | Text wrapping and filling
| `thread` | Create multiple threads of control within one interpreter.
| `threading` | Higher-level threading interface.
| `time` | Time access and conversions.
| `timeit` | Measure the execution time of small code snippets.
| `Tix` | Tk Extension Widgets for Tkinter
| `Tkinter` | Interface to Tcl/Tk for graphical user interfaces
| `token` | Constants representing terminal nodes of the parse tree.
| `tokenize` | Lexical scanner for Python source code.
| `trace` | Trace or track Python statement execution.
| `traceback` | Print or retrieve a stack traceback.
| `ttk` | Tk themed widget set
| `tty` (Unix) | Utility functions that perform common terminal control operations.
| `turtle` | Turtle graphics for Tk
| `types` | Names for built-in types.
| U |
| `unicodedata` | Access the Unicode Database.
| `unittest` | Unit testing framework for Python.
| `urllib` | Open an arbitrary network resource by URL (requires sockets).
| `urllib2` | Next generation URL opening library.
| `urlparse` | Parse URLs into or assemble them from components.
| `user` | Deprecated: A standard way to reference user-specific modules.
| `UserDict` | Class wrapper for dictionary objects.
| `UserList` | Class wrapper for list objects.
| `UserString` | Class wrapper for string objects.
| `uu` | Encode and decode files in uuencode format.
| `uuid` | UUID objects (universally unique identifiers) according to RFC 4122
| V |
| `videoreader` (Mac) | Deprecated: Read QuickTime movies frame by frame for further processing.
| W |
| `W` (Mac) | Deprecated: Widgets for the Mac, built on top of FrameWork.
| `warnings` | Issue warning messages and control their disposition.
| `wave` | Provide an interface to the WAV sound format.
| `weakref` | Support for weak references and weak dictionaries.
| `webbrowser` | Easy-to-use controller for Web browsers.
| `whichdb` | Guess which DBM-style module created a given database.
| `winsound` (Windows) | Access to the sound-playing machinery for Windows.
| `wsgiref` | WSGI Utilities and Reference Implementation.
| `wsgiref.handlers` | WSGI server/gateway base classes.
| `wsgiref.headers` | WSGI response header tools.
| `wsgiref.simple_server` | A simple WSGI HTTP server.
| `wsgiref.util` | WSGI environment utilities.
| `wsgiref.validate` | WSGI conformance checker.
| X |
| `xdrlib` | Encoders and decoders for the External Data Representation (XDR).
| `xml` |
| `xml.dom` | Document Object Model API for Python.
| `xml.dom.minidom` | Lightweight Document Object Model (DOM) implementation.
| `xml.dom.pulldom` | Support for building partial DOM trees from SAX events.
| `xml.etree.ElementTree` | Implementation of the ElementTree API.
| `xml.parsers.expat` | An interface to the Expat non-validating XML parser.
| `xml.sax` | Package containing SAX2 base classes and convenience functions.
| `xml.sax.handler` | Base classes for SAX event handlers.
| `xml.sax.saxutils` | Convenience functions and classes for use with SAX.
| `xml.sax.xmlreader` | Interface which SAX-compliant XML parsers must implement.
| `xmlrpclib` | XML-RPC client access.
| Z |
| `zipfile` | Read and write ZIP-format archive files.
| `zipimport` | support for importing Python modules from ZIP archives.
| `zlib` | Low-level interface to compression and decompression routines compatible with gzip.

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