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.
  • Passing the undocumented keyword argument prefix_chars to ~argparse.ArgumentParser.add_argument_group is now deprecated.
  • The argparse.FileType type converter is deprecated.
• builtins:
  • Generators: throw(type, exc, tb) and athrow(type, exc, tb) signature is deprecated: use throw(exc) and athrow(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 keywords and, else, for, if, in, is and or. In a future release it will be changed to a syntax error. (87999)
  • Support for __index__() and __int__() method returning non-int type: these methods will be required to return an instance of a strict subclass of int.
  • Support for __float__() method returning a strict subclass of float: these methods will be required to return an instance of float.
  • Support for __complex__() method returning a strict subclass of complex: these methods will be required to return an instance of complex.
• calendar: calendar.January and calendar.February constants are deprecated and replaced by calendar.JANUARY and calendar.FEBRUARY. (Contributed by Prince Roshan in 103636.)
• codecs: use open instead of codecs.open. (133038)
• !codeobject.co_lnotab: use the codeobject.co_lines method instead.
• datetime:
  • ~datetime.datetime.utcnow: use datetime.datetime.now(tz=datetime.UTC).
  • ~datetime.datetime.utcfromtimestamp: use datetime.datetime.fromtimestamp(timestamp, tz=datetime.UTC).
• gettext: Plural value must be an integer.
• importlib:
  • ~importlib.util.cache_from_source debug_override parameter is deprecated: use the optimization parameter instead.
• importlib.metadata:
  • EntryPoints tuple interface.
  • Implicit None on return values.
• logging: the warn() method has been deprecated since Python 3.3, use ~logging.warning instead.
• mailbox: Use of StringIO input and text mode is deprecated, use BytesIO and binary mode instead.
• os: Calling os.register_at_fork in a multi-threaded process.
• os.path: os.path.commonprefix is deprecated, use os.path.commonpath for path prefixes. The os.path.commonprefix function is being deprecated due to having a misleading name and module. The function is not safe to use for path prefixes despite being included in a module about path manipulation, meaning it is easy to accidentally introduce path traversal vulnerabilities into Python programs by using this function.
• !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 91760.)
• shutil: ~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: ~ssl.SSLContext.set_npn_protocols and !selected_npn_protocol are deprecated: use ALPN instead.
  • ssl.OP_NO_SSL* options
  • ssl.OP_NO_TLS* options
  • ssl.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
• threading methods:
  • !threading.Condition.notifyAll: use ~threading.Condition.notify_all.
  • !threading.Event.isSet: use ~threading.Event.is_set.
  • !threading.Thread.isDaemon, threading.Thread.setDaemon: use threading.Thread.daemon attribute.
  • !threading.Thread.getName, threading.Thread.setName: use threading.Thread.name attribute.
  • !threading.currentThread: use threading.current_thread.
  • !threading.activeCount: use threading.active_count.
• typing.Text (92332).
• The internal class typing._UnionGenericAlias is no longer used to implement typing.Union. To preserve compatibility with users using this private class, a compatibility shim will be provided until at least Python 3.17. (Contributed by Jelle Zijlstra in 105499.)
• unittest.IsolatedAsyncioTestCase: it is deprecated to return a value that is not None from a test case.
• urllib.parse deprecated functions: ~urllib.parse.urlparse instead
  • splitattr()
  • splithost()
  • splitnport()
  • splitpasswd()
  • splitport()
  • splitquery()
  • splittag()
  • splittype()
  • splituser()
  • splitvalue()
  • to_bytes()
• wsgiref: SimpleHandler.stdout.write() should not do partial writes.
• xml.etree.ElementTree: Testing the truth value of an ~xml.etree.ElementTree.Element is deprecated. In a future release it will always return True. Prefer explicit len(elem) or elem is not None tests instead.
• sys._clear_type_cache is deprecated: use sys._clear_internal_caches instead.