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.
备注
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.)
os¶
Added the
os.environ.refresh()
method to updateos.environ
with changes to the environment made byos.putenv()
, byos.unsetenv()
, or made outside Python in the same process. (Contributed by Victor Stinner in gh-120057.)
pathlib¶
Add
pathlib.Path.copy()
, which copies the content of one file to another, likeshutil.copyfile()
. (Contributed by Barney Gale in gh-73991.)Add
pathlib.Path.copytree()
, which copies one directory tree to another. (Contributed by Barney Gale in gh-73991.)
symtable¶
Expose the following
symtable.Symbol
methods:(Contributed by Bénédikt Tran in gh-120029.)
Optimizations¶
Deprecated¶
Removed¶
argparse¶
Remove the type, choices, and metavar parameters of
argparse.BooleanOptionalAction
. They were deprecated since 3.12.
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-definedvisit_Num
,visit_Str
,visit_Bytes
,visit_NameConstant
andvisit_Ellipsis
methods on customast.NodeVisitor
subclasses will no longer be called when theNodeVisitor
subclass is visiting an AST. Define avisit_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.)
asyncio¶
Remove the following classes and functions. They were all deprecated and emitted deprecation warnings since Python 3.12:
asyncio.AbstractChildWatcher
asyncio.SafeChildWatcher
asyncio.MultiLoopChildWatcher
asyncio.FastChildWatcher
asyncio.ThreadedChildWatcher
asyncio.PidfdChildWatcher
asyncio.AbstractEventLoopPolicy.get_child_watcher()
asyncio.AbstractEventLoopPolicy.set_child_watcher()
asyncio.get_child_watcher()
asyncio.set_child_watcher()
(Contributed by Kumar Aditya in gh-120804.)
collections.abc¶
Remove
collections.abc.ByteString
. It had previously raised aDeprecationWarning
since Python 3.12.
email¶
Remove the isdst parameter from
email.utils.localtime()
. (Contributed by Hugo van Kemenade in gh-118798.)
importlib¶
Remove deprecated
importlib.abc
classes:importlib.abc.ResourceReader
importlib.abc.Traversable
importlib.abc.TraversableResources
Use
importlib.resources.abc
classes instead:(Contributed by Jason R. Coombs and Hugo van Kemenade in gh-93963.)
itertools¶
Remove
itertools
support for copy, deepcopy, and pickle operations. These had previously raised aDeprecationWarning
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()
andis_relative_to()
. In previous versions, any such arguments are joined onto other.
pty¶
Remove deprecated
pty.master_open()
andpty.slave_open()
. They had previously raised aDeprecationWarning
since Python 3.12. Usepty.openpty()
instead. (Contributed by Nikita Sobolev in gh-118824.)
sqlite3¶
Remove
version
andversion_info
fromsqlite3
. (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 asqlite3.ProgrammingError
. (Contributed by Erlend E. Aasland in gh-118928 and gh-101693.)
typing¶
Remove
typing.ByteString
. It had previously raised aDeprecationWarning
since Python 3.12.
urllib¶
Remove deprecated
Quoter
class fromurllib.parse
. It had previously raised aDeprecationWarning
since Python 3.11. (Contributed by Nikita Sobolev in gh-118827.)
Others¶
Using
NotImplemented
in a boolean context will now raise aTypeError
. It had previously raised aDeprecationWarning
since Python 3.9. (Contributed by Jelle Zijlstra in gh-118767.)The
int()
built-in no longer delegates to__trunc__()
. Classes that want to support conversion to integer must implement either__int__()
or__index__()
. (Contributed by Mark Dickinson in gh-119743.)
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¶
Add
PyLong_GetSign()
function to get the sign ofint
objects. (Contributed by Sergey B Kirpichev in gh-116560.)Add a new
PyUnicodeWriter
API to create a Pythonstr
object:(Contributed by Victor Stinner in gh-119182.)
Porting to Python 3.14¶
Deprecated¶
Macros
Py_IS_NAN
,Py_IS_INFINITY
andPy_IS_FINITE
are soft deprecated, use insteadisnan
,isinf
andisfinite
available frommath.h
since C99. (Contributed by Sergey B Kirpichev in gh-119613.)
Removed¶
Creating
immutable types
with mutable bases was deprecated since 3.12 and now raises aTypeError
.