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Python standard library

See also :ref:`Supported platforms and architectures <platforms>`, :ref:`History of Python <history>`, and :ref:`Python Import <import>`.

sys.stdlib_module_names

  • Python 3.14: 290 modules
    • Add (1): annotationlib
  • Python 3.13: 289 modules
    • Add (10):
      • _android_support,
      • _colorize,
      • _interpchannels,
      • _interpqueues,
      • _interpreters,
      • _ios_support (PEP 730),
      • _opcode_metadata,
      • _pyrepl (PEP 762),
      • _suggestions,
      • _sysconfig.
    • Remove (21), PEP 594: _crypt, _msi, aifc, audioop, cgi, cgitb, chunk, crypt, imghdr, mailcap, msilib, nis, nntplib, ossaudiodev, pipes, sndhdr, spwd, sunau, telnetlib, uu, xdrlib.
    • Remove (1): lib2to3.
  • Python 3.12: 301 modules
    • Add (4):
      • _sha2,
      • _pylong,
      • _pydatetime,
      • _wmi.
    • Remove (8): _bootsubprocess, _sha256, _sha512, asynchat, asyncore, distutils, imp, smtpd
  • Python 3.11: 305 modules
    • Add (3):
      • tomllib (PEP 680),
      • _tokenize,
      • _typing.
    • Remove (1): binhex.
  • Python 3.10: 303 modules

sys.stdlib_module_names was added to Python 3.10. For Python 2.6 to 3.9, the 3rd party stdlib-list module can be used.

Talks

Maintain the stdlib outside Python?

Stdlib history

Python 3.13

Python 3.13 removed 20 module:

Python 3.12

Python 3.12 removed 5 module:

PEP 594

PEP 594 – Removing dead batteries from the standard library scheduled the removal of many stdlib modules in Python 3.12 and 3.13.

Python 3.11

Python 3.11 added 1 module:

Python 3.11 added 1 sub-module to existing packages:

  • wsgiref.types

Python 3.11 removed 1 module:

Note: asyncore, asynchat, smtplib were removed in Python 3.11, but then the SC asked to add them back

Python 3.10

Python 3.10 removed 3 modules:

Python 3.9

Python 3.9 added 2 modules:

  • graphlib
  • zoneinfo

Python 3.9 removed 2 modules:

  • dummy_threading: deprecated in Python 3.7; Python 3.7 requires threads to build: bpo-31370.
  • _dummy_thread: same.

Python 3.8

Python 3.8 added 1 sub-module to existing packages:

  • importlib.metadata

Python 3.8 removed 1 module:

Python 3.7

Python 3.7 added 2 modules:

Python 3.7 added 1 sub-module to existing packages:

Python 3.7 removed 2 modules:

  • fpectl: issue #73323, it was never enabled by default, never worked correctly on x86-64, and it changed the Python ABI in ways that caused unexpected breakage of C extensions.
  • macurl2path: issue #72512

Python 3.6

Python 3.6 added 1 module:

Python 3.6 removed 6 modules:

issue #72214: These removed modules were undocumented. They had been available in the platform specific Lib/plat-*/ directories, but were chronically out of date, inconsistently available across platforms, and unmaintained.

Python 3.5

Python 3.5 added 2 modules:

Python 3.4

Python 3.4 added 7 modules:

Python 3.3

Python 3.3 added 4 modules:

Python 3.3 added 1 sub-module to existing packages:

  • unittest.mock

Python 3.2

Python 3.2 added 2 modules:

Python 3.1

Python 3.1 added 1 module:

  • importlib

Python 3.1 added 1 sub-module to existing packages:

  • tkinter.ttk

Python 3.0

Python 3.0 removed 74 stdlib modules, related to PEP 3108.

Moreover, many Python 2.7 modules have been renamed by PEP 3108.

Removed Mac modules (24):

  • aepack
  • aetools
  • aetypes
  • buildtools
  • Carbon
  • cfmfile
  • ColorPicker
  • EasyDialogs
  • findertools
  • fm
  • FrameWork
  • gensuitemodule
  • ic
  • icopen
  • mac
  • macerrors
  • MacOS
  • macosa
  • macostools
  • macresource
  • MiniAEFrame
  • Nav
  • PixMapWrapper
  • videoreader

Removed IRIX modules (7):

  • al
  • DEVICE
  • flp
  • gl: Functions from the Silicon Graphics Graphics Library.
  • imgfile: Support for SGI imglib files
  • jpeg: Read and write JPEG files
  • sgi: random SGI-specific things

Removed modules, replaced by the email package (5):

  • mimetools
  • MimeWriter
  • mimify
  • multifile
  • rfc822

Other removed modules (38):

  • audiodev: Classes for manipulating audio devices (currently only for Sun and SGI)
  • Bastion: Providing restricted access to objects
  • bsddb
  • Canvas (tk)
  • cd: CD Audio Library
  • commands: Utility functions for running external commands
  • compiler: analyze Python source code and generating Python bytecode
  • dircache: read directory listing with cache
  • dl: dl.open()
  • exceptions: Standard exception classes
  • FixTk: Delay import _tkinter until we have set TCL_LIBRARY, imported by Tkinter`
  • fl: interface to Mark Overmars' FORMS Library
  • fpformat: General floating point formatting functions
  • future_builtins: Python 3 builtins
  • ihooks: Import hook support
  • imageop: Manipulate raw image data, replaced with PIL/Pillow
  • imputil: Import utilities
  • linuxaudiodev: Linux audio device (/dev/dsp) for python, replaced by ossaudiodev.
  • markupbase: Renamed to _markupbase, used by html.parser
  • md5: Replaced by hashlib
  • mhlib: Manipulate MH mailboxes from Python
  • mutex: Lock and queue for mutual exclusion
  • new: Interface to the creation of runtime implementation objects
  • os2emxpath: Common operations on OS/2 pathnames
  • popen2: Subprocesses with accessible I/O streams
  • posixfile: File-like objects with locking support
  • rexec: Restricted execution framework
  • sets: Unordered collections of unique elements, replaced by set() built-in type
  • sgmllib: Simple SGML parser
  • sha: Replaced by hashlib
  • sre: Replaced by re
  • statvfs: Replaced by os.statvfs()
  • stringold: Collection of string operations
  • strop: Common string manipulations, optimized for speed (C extension)
  • sunaudiodev (SunOS): Access to Sun audio hardware
  • toaiff: Convert "arbitrary" sound files to AIFF (Apple and SGI's audio format)
  • user: Hook to allow user-specified customization code to run
  • xmllib: Parser for XML, using the derived class as static DTD.