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What's New In Python 3.13

Release
Date

This article explains the new features in Python 3.13, compared to 3.12.

For full details, see the changelog <changelog>.

Note

Prerelease users should be aware that this document is currently in draft form. It will be updated substantially as Python 3.13 moves towards release, so it's worth checking back even after reading earlier versions.

Summary -- Release highlights

New Features

Other Language Changes

New Modules

  • None yet.

Improved Modules

pathlib

  • Add support for recursive wildcards in pathlib.PurePath.match. (Contributed by Barney Gale in 73435.)
  • Add follow_symlinks keyword-only argument to pathlib.Path.glob and ~pathlib.Path.rglob. (Contributed by Barney Gale in 77609.)

Optimizations

Deprecated

Removed

  • 594: Remove the !telnetlib module, deprecated in Python 3.11: use the projects telnetlib3 or Exscript instead. (Contributed by Victor Stinner in 104773.)
  • Remove the 2to3 program and the !lib2to3 module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104780.)
  • Namespaces typing.io and typing.re, deprecated in Python 3.8, are now removed. The items in those namespaces can be imported directly from typing. (Contributed by Sebastian Rittau in 92871.)
  • Remove the untested and undocumented webbrowser !MacOSX class, deprecated in Python 3.11. Use the !MacOSXOSAScript class (introduced in Python 3.2) instead. (Contributed by Hugo van Kemenade in 104804.)
  • Remove support for using pathlib.Path objects as context managers. This functionality was deprecated and made a no-op in Python 3.9.
  • Remove the undocumented !configparser.LegacyInterpolation class, deprecated in the docstring since Python 3.2, and with a deprecation warning since Python 3.11. (Contributed by Hugo van Kemenade in 104886.)
  • Remove the !turtle.RawTurtle.settiltangle method, deprecated in docs since Python 3.1 and with a deprecation warning since Python 3.11. (Contributed by Hugo van Kemenade in 104876.)

  • Removed the following unittest functions, deprecated in Python 3.11:

    • !unittest.findTestCases
    • !unittest.makeSuite
    • !unittest.getTestCaseNames

    Use ~unittest.TestLoader methods instead:

    • unittest.TestLoader.loadTestsFromModule
    • unittest.TestLoader.loadTestsFromTestCase
    • unittest.TestLoader.getTestCaseNames

    (Contributed by Hugo van Kemenade in 104835.)

  • 594: Remove the !cgi and :mod:!cgitb` modules, deprecated in Python 3.11.

    • cgi.FieldStorage can typically be replaced with urllib.parse.parse_qsl for GET and HEAD requests, and the email.message module or multipart PyPI project for POST and PUT.
    • cgi.parse() can be replaced by calling urllib.parse.parse_qs directly on the desired query string, except for multipart/form-data input, which can be handled as described for cgi.parse_multipart().
    • cgi.parse_multipart() can be replaced with the functionality in the email package (e.g. email.message.EmailMessage and email.message.Message) which implements the same MIME RFCs, or with the multipart PyPI project.

    • cgi.parse_header() can be replaced with the functionality in the email package, which implements the same MIME RFCs. For example, with email.message.EmailMessage:

      from email.message import EmailMessage
msg = EmailMessage()
msg['content-type'] = 'application/json; charset="utf8"'
main, params = msg.get_content_type(), msg['content-type'].params

    (Contributed by Victor Stinner in 104773.)

  • 594: Remove the !sndhdr module, deprecated in Python 3.11: use the projects filetype, puremagic, or python-magic instead. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !pipes module, deprecated in Python 3.11: use the subprocess module instead. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !ossaudiodev module, deprecated in Python 3.11: use the pygame project for audio playback. (Contributed by Victor Stinner in 104780.)
  • 594: Remove the !sunau module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !mailcap module, deprecated in Python 3.11. The mimetypes module provides an alternative. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !spwd module, deprecated in Python 3.11: the python-pam project can be used instead. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !nntplib module, deprecated in Python 3.11: the PyPI nntplib project can be used instead. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !nis module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !xdrlib module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !msilib module, deprecated in Python 3.11. (Contributed by Zachary Ware in 104773.)

  • 594: Remove the !crypt module and its private !_crypt extension, deprecated in Python 3.11. The hashlib module is a potential replacement for certain use cases. Otherwise, the following PyPI projects can be used:

    • bcrypt: Modern password hashing for your software and your servers.
    • passlib: Comprehensive password hashing framework supporting over 30 schemes.
    • argon2-cffi: The secure Argon2 password hashing algorithm.
    • legacycrypt: Wrapper to the POSIX crypt library call and associated functionality.

    (Contributed by Victor Stinner in 104773.)

  • 594: Remove the !uu module, deprecated in Python 3.11: the base64 module is a modern alternative. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !aifc module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !audioop module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • 594: Remove the !chunk module, deprecated in Python 3.11. (Contributed by Victor Stinner in 104773.)
  • Remove support for the keyword-argument method of creating typing.TypedDict types, deprecated in Python 3.11. (Contributed by Tomas Roun in 104786.)
  • 594: Remove the !imghdr module, deprecated in Python 3.11: use the projects filetype, puremagic, or python-magic instead. (Contributed by Victor Stinner in 104773.)
  • Remove the untested and undocumented !unittest.TestProgram.usageExit method, deprecated in Python 3.11. (Contributed by Hugo van Kemenade in 104992.)
  • Remove the !tkinter.tix module, deprecated in Python 3.6. The third-party Tix library which the module wrapped is unmaintained. (Contributed by Zachary Ware in 75552.)

Porting to Python 3.13

This section lists previously described changes and other bugfixes that may require changes to your code.

Build Changes

C API Changes

New Features

  • You no longer have to define the PY_SSIZE_T_CLEAN macro before including Python.h when using # formats in format codes <arg-parsing-string-and-buffers>. APIs accepting the format codes always use Py_ssize_t for # formats. (Contributed by Inada Naoki in 104922.)

Porting to Python 3.13

Deprecated

Removed