Release: | |release| |
---|---|
Date: | |today| |
This article explains the new features in Python 3.13, compared to 3.12.
For full details, see the :ref:`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.
- None yet.
- Add
'w'
type code that can be used for Unicode strings. It can be used instead of'u'
type code, which is deprecated. (Contributed by Inada Naoki in :gh:`80480`.)
The :class:`io.IOBase` finalizer now logs the close()
method errors with
:data:`sys.unraisablehook`. Previously, errors were ignored silently by default,
and only logged in :ref:`Python Development Mode <devmode>` or on :ref:`Python
built on debug mode <debug-build>`.
(Contributed by Victor Stinner in :gh:`62948`.)
- Add :exc:`pathlib.UnsupportedOperation`, which is raised instead of :exc:`NotImplementedError` when a path operation isn't supported. (Contributed by Barney Gale in :gh:`89812`.)
- Add support for recursive wildcards in :meth:`pathlib.PurePath.match`. (Contributed by Barney Gale in :gh:`73435`.)
- Add follow_symlinks keyword-only argument to :meth:`pathlib.Path.glob`, :meth:`~pathlib.Path.rglob`, :meth:`~pathlib.Path.is_file`, and :meth:`~pathlib.Path.is_dir`. (Contributed by Barney Gale in :gh:`77609` and :gh:`105793`.)
- Add show_group paramter to :func:`traceback.TracebackException.format_exception_only` to format the nested exceptions of a :exc:`BaseExceptionGroup` instance, recursively. (Contributed by Irit Katriel in :gh:`105292`.)
- Add :func:`typing.get_protocol_members` to return the set of members defining a :class:`typing.Protocol`. Add :func:`typing.is_protocol` to check whether a class is a :class:`typing.Protocol`. (Contributed by Jelle Zijlstra in :gh:`104873`.)
- :mod:`wave`: Deprecate the
getmark()
,setmark()
andgetmarkers()
methods of the :class:`wave.Wave_read` and :class:`wave.Wave_write` classes. They will be removed in Python 3.15. (Contributed by Victor Stinner in :gh:`105096`.) - Creating a :class:`typing.NamedTuple` class using keyword arguments to denote
the fields (
NT = NamedTuple("NT", x=int, y=int)
) is deprecated, and will be disallowed in Python 3.15. Use the class-based syntax or the functional syntax instead. (Contributed by Alex Waygood in :gh:`105566`.) - When using the functional syntax to create a :class:`typing.NamedTuple`
class or a :class:`typing.TypedDict` class, failing to pass a value to the
'fields' parameter (
NT = NamedTuple("NT")
orTD = TypedDict("TD")
) is deprecated. PassingNone
to the 'fields' parameter (NT = NamedTuple("NT", None)
orTD = TypedDict("TD", None)
) is also deprecated. Both will be disallowed in Python 3.15. To create a NamedTuple class with 0 fields, useclass NT(NamedTuple): pass
orNT = NamedTuple("NT", [])
. To create a TypedDict class with 0 fields, useclass TD(TypedDict): pass
orTD = TypedDict("TD", {})
. (Contributed by Alex Waygood in :gh:`105566` and :gh:`105570`.) - :mod:`array`'s
'u'
format code, deprecated in docs since Python 3.3, emits :exc:`DeprecationWarning` since 3.13 and will be removed in Python 3.16. Use the'w'
format code instead. (contributed by Hugo van Kemenade in :gh:`80480`) - :mod:`ctypes`: Deprecate undocumented :func:`!ctypes.SetPointerType`
and :func:`!ctypes.ARRAY` functions.
Replace
ctypes.SetPointerType(item_type, size)
withitem_type * size
. (Contributed by Victor Stinner in :gh:`105733`.)
PEP 594: Remove the :mod:`!telnetlib` module, deprecated in Python 3.11: use the projects telnetlib3 or Exscript instead. (Contributed by Victor Stinner in :gh:`104773`.)
Remove the
2to3
program and the :mod:`!lib2to3` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104780`.)Namespaces
typing.io
andtyping.re
, deprecated in Python 3.8, are now removed. The items in those namespaces can be imported directly from :mod:`typing`. (Contributed by Sebastian Rittau in :gh:`92871`.)Remove the untested and undocumented :mod:`webbrowser` :class:`!MacOSX` class, deprecated in Python 3.11. Use the :class:`!MacOSXOSAScript` class (introduced in Python 3.2) instead. (Contributed by Hugo van Kemenade in :gh:`104804`.)
Remove support for using :class:`pathlib.Path` objects as context managers. This functionality was deprecated and made a no-op in Python 3.9.
Remove the undocumented :class:`!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 :gh:`104886`.)
Remove the :meth:`!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 :gh:`104876`.)
Removed the following :mod:`unittest` functions, deprecated in Python 3.11:
Use :class:`~unittest.TestLoader` methods instead:
- :meth:`unittest.TestLoader.loadTestsFromModule`
- :meth:`unittest.TestLoader.loadTestsFromTestCase`
- :meth:`unittest.TestLoader.getTestCaseNames`
(Contributed by Hugo van Kemenade in :gh:`104835`.)
PEP 594: Remove the :mod:`!cgi` and :mod:`!cgitb` modules, deprecated in Python 3.11.
cgi.FieldStorage
can typically be replaced with :func:`urllib.parse.parse_qsl` forGET
andHEAD
requests, and the :mod:`email.message` module or multipart PyPI project forPOST
andPUT
.cgi.parse()
can be replaced by calling :func:`urllib.parse.parse_qs` directly on the desired query string, except formultipart/form-data
input, which can be handled as described forcgi.parse_multipart()
.cgi.parse_multipart()
can be replaced with the functionality in the :mod:`email` package (e.g. :class:`email.message.EmailMessage` and :class:`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 :mod:`email` package, which implements the same MIME RFCs. For example, with :class:`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 :gh:`104773`.)
PEP 594: Remove the :mod:`!sndhdr` module, deprecated in Python 3.11: use the projects filetype, puremagic, or python-magic instead. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!pipes` module, deprecated in Python 3.11: use the :mod:`subprocess` module instead. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!ossaudiodev` module, deprecated in Python 3.11: use the pygame project for audio playback. (Contributed by Victor Stinner in :gh:`104780`.)
PEP 594: Remove the :mod:`!sunau` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!mailcap` module, deprecated in Python 3.11. The :mod:`mimetypes` module provides an alternative. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!spwd` module, deprecated in Python 3.11: the python-pam project can be used instead. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!nntplib` module, deprecated in Python 3.11: the PyPI nntplib project can be used instead. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!nis` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!xdrlib` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!msilib` module, deprecated in Python 3.11. (Contributed by Zachary Ware in :gh:`104773`.)
PEP 594: Remove the :mod:`!crypt` module and its private :mod:`!_crypt` extension, deprecated in Python 3.11. The :mod:`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 :gh:`104773`.)
PEP 594: Remove the :mod:`!uu` module, deprecated in Python 3.11: the :mod:`base64` module is a modern alternative. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!aifc` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!audioop` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
PEP 594: Remove the :mod:`!chunk` module, deprecated in Python 3.11. (Contributed by Victor Stinner in :gh:`104773`.)
Remove support for the keyword-argument method of creating :class:`typing.TypedDict` types, deprecated in Python 3.11. (Contributed by Tomas Roun in :gh:`104786`.)
PEP 594: Remove the :mod:`!imghdr` module, deprecated in Python 3.11: use the projects filetype, puremagic, or python-magic instead. (Contributed by Victor Stinner in :gh:`104773`.)
Remove the untested and undocumented :meth:`!unittest.TestProgram.usageExit` method, deprecated in Python 3.11. (Contributed by Hugo van Kemenade in :gh:`104992`.)
Remove the :mod:`!tkinter.tix` module, deprecated in Python 3.6. The third-party Tix library which the module wrapped is unmaintained. (Contributed by Zachary Ware in :gh:`75552`.)
Remove the old trashcan macros
Py_TRASHCAN_SAFE_BEGIN
andPy_TRASHCAN_SAFE_END
. They should be replaced by the new macrosPy_TRASHCAN_BEGIN
andPy_TRASHCAN_END
. The new macros were added in Python 3.8 and the old macros were deprecated in Python 3.11. (Contributed by Irit Katriel in :gh:`105111`.)Remove
locale.resetlocale()
function deprecated in Python 3.11: uselocale.setlocale(locale.LC_ALL, "")
instead. (Contributed by Victor Stinner in :gh:`104783`.)Remove the undocumented and untested
logging.Logger.warn()
method, deprecated since Python 3.3, which was an alias to the :meth:`logging.Logger.warning` method: use the :meth:`logging.Logger.warning` method instead. (Contributed by Victor Stinner in :gh:`105376`.)Remove cafile, capath and cadefault parameters of the :func:`urllib.request.urlopen` function, deprecated in Python 3.6: use the context parameter instead. Please use :meth:`ssl.SSLContext.load_cert_chain` instead, or let :func:`ssl.create_default_context` select the system's trusted CA certificates for you. (Contributed by Victor Stinner in :gh:`105382`.)
Remove deprecated
webbrowser.MacOSXOSAScript._name
attribute. Use :attr:`webbrowser.MacOSXOSAScript.name <webbrowser.controller.name>` attribute instead. (Contributed by Nikita Sobolev in :gh:`105546`.)Remove undocumented, never working, and deprecated
re.template
function andre.TEMPLATE
flag (andre.T
alias). (Contributed by Serhiy Storchaka and Nikita Sobolev in :gh:`105687`.)
This section lists previously described changes and other bugfixes that may require changes to your code.
The old trashcan macros
Py_TRASHCAN_SAFE_BEGIN
andPy_TRASHCAN_SAFE_END
were removed. They should be replaced by the new macrosPy_TRASHCAN_BEGIN
andPy_TRASHCAN_END
.A tp_dealloc function that has the old macros, such as:
static void mytype_dealloc(mytype *p) { PyObject_GC_UnTrack(p); Py_TRASHCAN_SAFE_BEGIN(p); ... Py_TRASHCAN_SAFE_END }
should migrate to the new macros as follows:
static void mytype_dealloc(mytype *p) { PyObject_GC_UnTrack(p); Py_TRASHCAN_BEGIN(p, mytype_dealloc) ... Py_TRASHCAN_END }
Note that
Py_TRASHCAN_BEGIN
has a second argument which should be the deallocation function it is in.
- Autoconf 2.71 and aclocal 1.16.4 is now required to regenerate :file:`!configure`. (Contributed by Christian Heimes in :gh:`89886`.)
- SQLite 3.15.2 or newer is required to build the :mod:`sqlite3` extension module. (Contributed by Erlend Aasland in :gh:`105875`.)
- You no longer have to define the
PY_SSIZE_T_CLEAN
macro before including :file:`Python.h` when using#
formats in :ref:`format codes <arg-parsing-string-and-buffers>`. APIs accepting the format codes always usePy_ssize_t
for#
formats. (Contributed by Inada Naoki in :gh:`104922`.) - Add :c:func:`PyImport_AddModuleRef`: similar to :c:func:`PyImport_AddModule`, but return a :term:`strong reference` instead of a :term:`borrowed reference`. (Contributed by Victor Stinner in :gh:`105922`.)
- Add :c:func:`PyWeakref_GetRef` function: similar to
:c:func:`PyWeakref_GetObject` but returns a :term:`strong reference`, or
NULL
if the referent is no longer live. (Contributed by Victor Stinner in :gh:`105927`.) - If Python is built in :ref:`debug mode <debug-build>` or :option:`with assertions <--with-assertions>`, :c:func:`PyTuple_SET_ITEM` and :c:func:`PyList_SET_ITEM` now check the index argument with an assertion. If the assertion fails, make sure that the size is set before. (Contributed by Victor Stinner in :gh:`106168`.)
Deprecate the old
Py_UNICODE
andPY_UNICODE_TYPE
types: use directly thewchar_t
type instead. Since Python 3.3,Py_UNICODE
andPY_UNICODE_TYPE
are just aliases towchar_t
. (Contributed by Victor Stinner in :gh:`105156`.)Deprecate old Python initialization functions:
- :c:func:`PySys_ResetWarnOptions`: clear :data:`sys.warnoptions` and :data:`!warnings.filters` instead.
- :c:func:`Py_GetExecPrefix`: get :data:`sys.exec_prefix` instead.
- :c:func:`Py_GetPath`: get :data:`sys.path` instead.
- :c:func:`Py_GetPrefix`: get :data:`sys.prefix` instead.
- :c:func:`Py_GetProgramFullPath`: get :data:`sys.executable` instead.
- :c:func:`Py_GetProgramName`: get :data:`sys.executable` instead.
- :c:func:`Py_GetPythonHome`: get :c:member:`PyConfig.home` or :envvar:`PYTHONHOME` environment variable instead.
(Contributed by Victor Stinner in :gh:`105145`.)
Deprecate the :c:func:`PyImport_ImportModuleNoBlock` function which is just an alias to :c:func:`PyImport_ImportModule` since Python 3.3. Scheduled for removal in Python 3.15. (Contributed by Victor Stinner in :gh:`105396`.)
Deprecate the :c:func:`PyWeakref_GetObject` and :c:func:`PyWeakref_GET_OBJECT` functions, which return a :term:`borrowed reference`: use the new :c:func:`PyWeakref_GetRef` function instead, it returns a :term:`strong reference`. The pythoncapi-compat project can be used to get :c:func:`PyWeakref_GetRef` on Python 3.12 and older. (Contributed by Victor Stinner in :gh:`105927`.)
Remove functions deprecated in Python 3.9.
PyEval_CallObject()
,PyEval_CallObjectWithKeywords()
: use :c:func:`PyObject_CallNoArgs` or :c:func:`PyObject_Call` instead. Warning: :c:func:`PyObject_Call` positional arguments must be a :class:`tuple` and must not be NULL, keyword arguments must be a :class:`dict` or NULL, whereas removed functions checked arguments type and accepted NULL positional and keyword arguments. To replacePyEval_CallObjectWithKeywords(func, NULL, kwargs)
with :c:func:`PyObject_Call`, pass an empty tuple as positional arguments using :c:func:`PyTuple_New(0) <PyTuple_New>`.PyEval_CallFunction()
: use :c:func:`PyObject_CallFunction` instead.PyEval_CallMethod()
: use :c:func:`PyObject_CallMethod` instead.PyCFunction_Call()
: use :c:func:`PyObject_Call` instead.
(Contributed by Victor Stinner in :gh:`105107`.)
Remove old buffer protocols deprecated in Python 3.0. Use :ref:`bufferobjects` instead.
:c:func:`!PyObject_CheckReadBuffer`: Use :c:func:`PyObject_CheckBuffer` to test if the object supports the buffer protocol. Note that :c:func:`PyObject_CheckBuffer` doesn't guarantee that :c:func:`PyObject_GetBuffer` will succeed. To test if the object is actually readable, see the next example of :c:func:`PyObject_GetBuffer`.
:c:func:`!PyObject_AsCharBuffer`, :c:func:`!PyObject_AsReadBuffer`: :c:func:`PyObject_GetBuffer` and :c:func:`PyBuffer_Release` instead:
Py_buffer view; if (PyObject_GetBuffer(obj, &view, PyBUF_SIMPLE) < 0) { return NULL; } // Use `view.buf` and `view.len` to read from the buffer. // You may need to cast buf as `(const char*)view.buf`. PyBuffer_Release(&view);
:c:func:`!PyObject_AsWriteBuffer`: Use :c:func:`PyObject_GetBuffer` and :c:func:`PyBuffer_Release` instead:
Py_buffer view; if (PyObject_GetBuffer(obj, &view, PyBUF_WRITABLE) < 0) { return NULL; } // Use `view.buf` and `view.len` to write to the buffer. PyBuffer_Release(&view);
(Contributed by Inada Naoki in :gh:`85275`.)
Remove the following old functions to configure the Python initialization, deprecated in Python 3.11:
PySys_AddWarnOptionUnicode()
: use :c:member:`PyConfig.warnoptions` instead.PySys_AddWarnOption()
: use :c:member:`PyConfig.warnoptions` instead.PySys_AddXOption()
: use :c:member:`PyConfig.xoptions` instead.PySys_HasWarnOptions()
: use :c:member:`PyConfig.xoptions` instead.PySys_SetArgvEx()
: set :c:member:`PyConfig.argv` instead.PySys_SetArgv()
: set :c:member:`PyConfig.argv` instead.PySys_SetPath()
: set :c:member:`PyConfig.module_search_paths` instead.Py_SetPath()
: set :c:member:`PyConfig.module_search_paths` instead.Py_SetProgramName()
: set :c:member:`PyConfig.program_name` instead.Py_SetPythonHome()
: set :c:member:`PyConfig.home` instead.Py_SetStandardStreamEncoding()
: set :c:member:`PyConfig.stdio_encoding` instead._Py_SetProgramFullPath()
: set :c:member:`PyConfig.executable` instead.
Use the new :c:type:`PyConfig` API of the :ref:`Python Initialization Configuration <init-config>` instead (PEP 587), added to Python 3.8. (Contributed by Victor Stinner in :gh:`105145`.)
Remove
PyEval_InitThreads()
andPyEval_ThreadsInitialized()
functions, deprecated in Python 3.9. Since Python 3.7,Py_Initialize()
always creates the GIL: callingPyEval_InitThreads()
did nothing andPyEval_ThreadsInitialized()
always returned non-zero. (Contributed by Victor Stinner in :gh:`105182`.)Remove
PyEval_AcquireLock()
andPyEval_ReleaseLock()
functions, deprecated in Python 3.2. They didn't update the current thread state. They can be replaced with:- :c:func:`PyEval_SaveThread` and :c:func:`PyEval_RestoreThread`;
- low-level :c:func:`PyEval_AcquireThread` and :c:func:`PyEval_RestoreThread`;
- or :c:func:`PyGILState_Ensure` and :c:func:`PyGILState_Release`.
(Contributed by Victor Stinner in :gh:`105182`.)
Remove the old private, undocumented and untested
_PyGC_FINALIZED()
macro which was kept for backward compatibility with Python 3.8 and older: use :c:func:`PyObject_GC_IsFinalized()` instead. The pythoncapi-compat project can be used to get this function on Python 3.8 and older. (Contributed by Victor Stinner in :gh:`105268`.)Remove the old aliases to functions calling functions which were kept for backward compatibility with Python 3.8 provisional API:
_PyObject_CallMethodNoArgs()
: usePyObject_CallMethodNoArgs()
_PyObject_CallMethodOneArg()
: usePyObject_CallMethodOneArg()
_PyObject_CallOneArg()
: usePyObject_CallOneArg()
_PyObject_FastCallDict()
: usePyObject_VectorcallDict()
_PyObject_Vectorcall()
: usePyObject_Vectorcall()
_PyObject_VectorcallMethod()
: usePyObject_VectorcallMethod()
_PyVectorcall_Function()
: usePyVectorcall_Function()
Just remove the underscore prefix to update your code. (Contributed by Victor Stinner in :gh:`106084`.)
Remove private
_PyObject_FastCall()
function: usePyObject_Vectorcall()
which is available since Python 3.8 (PEP 590). (Contributed by Victor Stinner in :gh:`106023`.)Remove
cpython/pytime.h
header file: it only contained private functions. (Contributed by Victor Stinner in :gh:`106316`.)