Deprecations¶
Pending Removal in Python 3.15¶
http.server.CGIHTTPRequestHandler
will be removed along with its related--cgi
flag topython -m http.server
. It was obsolete and rarely used. No direct replacement exists. Anything is better than CGI to interface a web server with a request handler.locale
:locale.getdefaultlocale()
was deprecated in Python 3.11 and originally planned for removal in Python 3.13 (gh-90817), but removal has been postponed to Python 3.15. Uselocale.setlocale()
,locale.getencoding()
andlocale.getlocale()
instead. (Contributed by Hugo van Kemenade in gh-111187.)pathlib
:pathlib.PurePath.is_reserved()
is deprecated and scheduled for removal in Python 3.15. Useos.path.isreserved()
to detect reserved paths on Windows.platform
:java_ver()
is deprecated and will be removed in 3.15. It was largely untested, had a confusing API, and was only useful for Jython support. (Contributed by Nikita Sobolev in gh-116349.)threading
: Passing any arguments tothreading.RLock()
is now deprecated. C version allows any numbers of args and kwargs, but they are just ignored. Python version does not allow any arguments. All arguments will be removed fromthreading.RLock()
in Python 3.15. (Contributed by Nikita Sobolev in gh-102029.)-
The undocumented keyword argument syntax for creating
NamedTuple
classes (NT = NamedTuple("NT", x=int)
) is deprecated, and will be disallowed in 3.15. Use the class-based syntax or the functional syntax instead.When using the functional syntax to create a
NamedTuple
class, failing to pass a value to the fields parameter (NT = NamedTuple("NT")
) is deprecated. PassingNone
to the fields parameter (NT = NamedTuple("NT", None)
) is also deprecated. Both will be disallowed in Python 3.15. To create aNamedTuple
class with 0 fields, useclass NT(NamedTuple): pass
orNT = NamedTuple("NT", [])
.
typing.TypedDict
: When using the functional syntax to create aTypedDict
class, failing to pass a value to the fields parameter (TD = TypedDict("TD")
) is deprecated. PassingNone
to the fields parameter (TD = TypedDict("TD", None)
) is also deprecated. Both will be disallowed in Python 3.15. To create aTypedDict
class with 0 fields, useclass TD(TypedDict): pass
orTD = TypedDict("TD", {})
.wave
: Deprecate thegetmark()
,setmark()
andgetmarkers()
methods of thewave.Wave_read
andwave.Wave_write
classes. They will be removed in Python 3.15. (Contributed by Victor Stinner in gh-105096.)
Pending Removal in Python 3.16¶
array
:array.array
'u'
type (wchar_t
): use the'w'
type instead (Py_UCS4
).builtins
:~bool
, bitwise inversion on bool.symtable
: Deprecatesymtable.Class.get_methods()
due to the lack of interest. (Contributed by Bénédikt Tran in gh-119698.)shutil
: Deprecateshutil.ExecError
, which hasn’t been raised by anyshutil
function since Python 3.4. It’s now an alias forRuntimeError
.
Pending Removal in Future Versions¶
The following APIs will be removed in the future, although there is currently no date scheduled for their removal.
argparse
: Nesting argument groups and nesting mutually exclusive groups are deprecated.-
bool(NotImplemented)
.Generators:
throw(type, exc, tb)
andathrow(type, exc, tb)
signature is deprecated: usethrow(exc)
andathrow(exc)
instead, the single argument signature.Currently Python accepts numeric literals immediately followed by keywords, for example
0in x
,1or x
,0if 1else 2
. It allows confusing and ambiguous expressions like[0x1for x in y]
(which can be interpreted as[0x1 for x in y]
or[0x1f or x in y]
). A syntax warning is raised if the numeric literal is immediately followed by one of keywordsand
,else
,for
,if
,in
,is
andor
. In a future release it will be changed to a syntax error. (gh-87999)Support for
__index__()
and__int__()
method returning non-int type: these methods will be required to return an instance of a strict subclass ofint
.Support for
__float__()
method returning a strict subclass offloat
: these methods will be required to return an instance offloat
.Support for
__complex__()
method returning a strict subclass ofcomplex
: these methods will be required to return an instance ofcomplex
.Delegation of
int()
to__trunc__()
method.Passing a complex number as the real or imag argument in the
complex()
constructor is now deprecated; it should only be passed as a single positional argument. (Contributed by Serhiy Storchaka in gh-109218.)
calendar
:calendar.January
andcalendar.February
constants are deprecated and replaced bycalendar.JANUARY
andcalendar.FEBRUARY
. (Contributed by Prince Roshan in gh-103636.)codeobject.co_lnotab
: use thecodeobject.co_lines()
method instead.-
utcnow()
: usedatetime.datetime.now(tz=datetime.UTC)
.utcfromtimestamp()
: usedatetime.datetime.fromtimestamp(timestamp, tz=datetime.UTC)
.
gettext
: Plural value must be an integer.-
load_module()
method: useexec_module()
instead.cache_from_source()
debug_override parameter is deprecated: use the optimization parameter instead.
-
EntryPoints
tuple interface.Implicit
None
on return values.
logging
: thewarn()
method has been deprecated since Python 3.3, usewarning()
instead.mailbox
: Use of StringIO input and text mode is deprecated, use BytesIO and binary mode instead.os
: Callingos.register_at_fork()
in multi-threaded process.pydoc.ErrorDuringImport
: A tuple value for exc_info parameter is deprecated, use an exception instance.re
: More strict rules are now applied for numerical group references and group names in regular expressions. Only sequence of ASCII digits is now accepted as a numerical reference. The group name in bytes patterns and replacement strings can now only contain ASCII letters and digits and underscore. (Contributed by Serhiy Storchaka in gh-91760.)sre_compile
,sre_constants
andsre_parse
modules.shutil
:rmtree()
»s onerror parameter is deprecated in Python 3.12; use the onexc parameter instead.ssl
options and protocols:ssl.SSLContext
without protocol argument is deprecated.ssl.SSLContext
:set_npn_protocols()
andselected_npn_protocol()
are deprecated: use ALPN instead.ssl.OP_NO_SSL*
optionsssl.OP_NO_TLS*
optionsssl.PROTOCOL_SSLv3
ssl.PROTOCOL_TLS
ssl.PROTOCOL_TLSv1
ssl.PROTOCOL_TLSv1_1
ssl.PROTOCOL_TLSv1_2
ssl.TLSVersion.SSLv3
ssl.TLSVersion.TLSv1
ssl.TLSVersion.TLSv1_1
sysconfig.is_python_build()
check_home parameter is deprecated and ignored.threading
methods:threading.Condition.notifyAll()
: usenotify_all()
.threading.Event.isSet()
: useis_set()
.threading.Thread.isDaemon()
,threading.Thread.setDaemon()
: usethreading.Thread.daemon
attribute.threading.Thread.getName()
,threading.Thread.setName()
: usethreading.Thread.name
attribute.threading.currentThread()
: usethreading.current_thread()
.threading.activeCount()
: usethreading.active_count()
.
unittest.IsolatedAsyncioTestCase
: it is deprecated to return a value that is notNone
from a test case.urllib.parse
deprecated functions:urlparse()
insteadsplitattr()
splithost()
splitnport()
splitpasswd()
splitport()
splitquery()
splittag()
splittype()
splituser()
splitvalue()
to_bytes()
urllib.request
:URLopener
andFancyURLopener
style of invoking requests is deprecated. Use newerurlopen()
functions and methods.wsgiref
:SimpleHandler.stdout.write()
should not do partial writes.xml.etree.ElementTree
: Testing the truth value of anElement
is deprecated. In a future release it will always returnTrue
. Prefer explicitlen(elem)
orelem is not None
tests instead.zipimport.zipimporter.load_module()
is deprecated: useexec_module()
instead.
C API Deprecations¶
Pending Removal in Python 3.15¶
The bundled copy of
libmpdecimal
.PyImport_ImportModuleNoBlock()
: usePyImport_ImportModule()
instead.PyWeakref_GET_OBJECT()
: usePyWeakref_GetRef()
instead.PyWeakref_GetObject()
: usePyWeakref_GetRef()
instead.Py_UNICODE_WIDE
type: usewchar_t
instead.Py_UNICODE
type: usewchar_t
instead.Python initialization functions:
PySys_ResetWarnOptions()
: clearsys.warnoptions
andwarnings.filters
instead.Py_GetExecPrefix()
: getsys.exec_prefix
instead.Py_GetPath()
: getsys.path
instead.Py_GetPrefix()
: getsys.prefix
instead.Py_GetProgramFullPath()
: getsys.executable
instead.Py_GetProgramName()
: getsys.executable
instead.Py_GetPythonHome()
: getPyConfig.home
or thePYTHONHOME
environment variable instead.
Pending Removal in Future Versions¶
The following APIs are deprecated and will be removed, although there is currently no date scheduled for their removal.
Py_TPFLAGS_HAVE_FINALIZE
: unneeded since Python 3.8.PyErr_Fetch()
: usePyErr_GetRaisedException()
instead.PyErr_NormalizeException()
: usePyErr_GetRaisedException()
instead.PyErr_Restore()
: usePyErr_SetRaisedException()
instead.PyModule_GetFilename()
: usePyModule_GetFilenameObject()
instead.PyOS_AfterFork()
: usePyOS_AfterFork_Child()
instead.PySlice_GetIndicesEx()
: usePySlice_Unpack()
andPySlice_AdjustIndices()
instead.PyUnicode_AsDecodedObject()
: usePyCodec_Decode()
instead.PyUnicode_AsDecodedUnicode()
: usePyCodec_Decode()
instead.PyUnicode_AsEncodedObject()
: usePyCodec_Encode()
instead.PyUnicode_AsEncodedUnicode()
: usePyCodec_Encode()
instead.PyUnicode_READY()
: unneeded since Python 3.12PyErr_Display()
: usePyErr_DisplayException()
instead._PyErr_ChainExceptions()
: use_PyErr_ChainExceptions1
instead.PyBytesObject.ob_shash
member: callPyObject_Hash()
instead.PyDictObject.ma_version_tag
member.Thread Local Storage (TLS) API:
PyThread_create_key()
: usePyThread_tss_alloc()
instead.PyThread_delete_key()
: usePyThread_tss_free()
instead.PyThread_set_key_value()
: usePyThread_tss_set()
instead.PyThread_get_key_value()
: usePyThread_tss_get()
instead.PyThread_delete_key_value()
: usePyThread_tss_delete()
instead.PyThread_ReInitTLS()
: unneeded since Python 3.7.