Pending removal in Python 3.17

• datetime:
  • ~datetime.datetime.strptime calls using a format string containing %e (day of month) without a year. This has been deprecated since Python 3.15. (Contributed by Stan Ulbrych in 70647.)
• collections.abc:

  • collections.abc.ByteString is scheduled for removal in Python 3.17.

    Use isinstance(obj, collections.abc.Buffer) to test if obj implements the buffer protocol <bufferobjects> at runtime. For use in type annotations, either use ~collections.abc.Buffer or a union that explicitly specifies the types your code supports (e.g., bytes | bytearray | memoryview).

    !ByteString was originally intended to be an abstract class that would serve as a supertype of both bytes and bytearray. However, since the ABC never had any methods, knowing that an object was an instance of !ByteString never actually told you anything useful about the object. Other common buffer types such as memoryview were also never understood as subtypes of !ByteString (either at runtime or by static type checkers).

    See PEP 688 <688#current-options> for more details. (Contributed by Shantanu Jain in 91896.)

• encodings:
  • Passing non-ascii encoding names to encodings.normalize_encoding is deprecated and scheduled for removal in Python 3.17. (Contributed by Stan Ulbrych in 136702.)
• profile:
  • The !profile module is deprecated and will be removed in Python 3.17. Use profiling.tracing instead, which provides a compatible API. See 799 for details. (Contributed by Pablo Galindo and László Kiss Kollár in 138122.)
• webbrowser:
  • !webbrowser.MacOSXOSAScript is deprecated in favour of !webbrowser.MacOS. (137586)
• typing:

  • Before Python 3.14, old-style unions were implemented using the private class typing._UnionGenericAlias. This class is no longer needed for the implementation, but it has been retained for backward compatibility, with removal scheduled for Python 3.17. Users should use documented introspection helpers like typing.get_origin and typing.get_args instead of relying on private implementation details.

  • typing.ByteString, deprecated since Python 3.9, is scheduled for removal in Python 3.17.

    Use isinstance(obj, collections.abc.Buffer) to test if obj implements the buffer protocol <bufferobjects> at runtime. For use in type annotations, either use ~collections.abc.Buffer or a union that explicitly specifies the types your code supports (e.g., bytes | bytearray | memoryview).

    !ByteString was originally intended to be an abstract class that would serve as a supertype of both bytes and bytearray. However, since the ABC never had any methods, knowing that an object was an instance of !ByteString never actually told you anything useful about the object. Other common buffer types such as memoryview were also never understood as subtypes of !ByteString (either at runtime or by static type checkers).

    See PEP 688 <688#current-options> for more details. (Contributed by Shantanu Jain in 91896.)

• tkinter:
  • The !tkinter.Variable methods !trace_variable, !trace (an alias of !trace_variable), !trace_vdelete and !trace_vinfo, deprecated since Python 3.14, are scheduled for removal in Python 3.17. Use !trace_add, !trace_remove and !trace_info instead. (Contributed by Serhiy Storchaka in 120220.)