What’s New In Python 3.14

Editor:

TBD

This article explains the new features in Python 3.14, compared to 3.13.

For full details, see the changelog.

Note

Prerelease users should be aware that this document is currently in draft form. It will be updated substantially as Python 3.14 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

ast

Added ast.compare() for comparing two ASTs. (Contributed by Batuhan Taskaya and Jeremy Hylton in bpo-15987)

Optimizations

Deprecated

Removed

ast

• Remove the following classes. They were all deprecated since Python 3.8, and have emitted deprecation warnings since Python 3.12:

  • ast.Num

  • ast.Str

  • ast.Bytes

  • ast.NameConstant

  • ast.Ellipsis

  Use ast.Constant instead. As a consequence of these removals, user-defined visit_Num, visit_Str, visit_Bytes, visit_NameConstant and visit_Ellipsis methods on custom ast.NodeVisitor subclasses will no longer be called when the NodeVisitor subclass is visiting an AST. Define a visit_Constant method instead.

  Also, remove the following deprecated properties on ast.Constant, which were present for compatibility with the now-removed AST classes:

  • ast.Constant.n

  • ast.Constant.s

  Use ast.Constant.value instead.

  (Contributed by Alex Waygood in gh-119562.)

argparse

• Remove the type, choices, and metavar parameters of argparse.BooleanOptionalAction. They were deprecated since 3.12.

collections.abc

• Remove collections.abc.ByteString. It had previously raised a DeprecationWarning since Python 3.12.

email

• Remove the isdst parameter from email.utils.localtime(). (Contributed by Hugo van Kemenade in gh-118798.)

itertools

• Remove itertools support for copy, deepcopy, and pickle operations. These had previously raised a DeprecationWarning since Python 3.12. (Contributed by Raymond Hettinger in gh-101588.)

pathlib

• Remove support for passing additional keyword arguments to pathlib.Path. In previous versions, any such arguments are ignored.

• Remove support for passing additional positional arguments to pathlib.PurePath.relative_to() and is_relative_to(). In previous versions, any such arguments are joined onto other.

sqlite3

• Remove version and version_info from sqlite3. (Contributed by Hugo van Kemenade in gh-118924.)

• Disallow using a sequence of parameters with named placeholders. This had previously raised a DeprecationWarning since Python 3.12; it will now raise a sqlite3.ProgrammingError. (Contributed by Erlend E. Aasland in gh-118928 and gh-101693.)

typing

• Remove typing.ByteString. It had previously raised a DeprecationWarning since Python 3.12.

Others

• Using NotImplemented in a boolean context will now raise a TypeError. It had previously raised a DeprecationWarning since Python 3.9. (Contributed by Jelle Zijlstra in gh-118767.)

Porting to Python 3.14

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

Build Changes

C API Changes

New Features

Porting to Python 3.14

Deprecated

Removed