Pending removal in Python 3.18

• No longer accept a boolean value when a file descriptor is expected. (Contributed by Serhiy Storchaka in gh-82626.)

• decimal:

  • The non-standard and undocumented Decimal format specifier 'N', which is only supported in the decimal module’s C implementation, has been deprecated since Python 3.13. (Contributed by Serhiy Storchaka in gh-89902.)

• Deprecations defined by PEP 829:

  • import lines in name.pth files are silently ignored.

  (Contributed by Barry Warsaw in gh-148641.)

• functools:

  • Using a return annotation to infer the dispatch type for functools.singledispatch() or functools.singledispatchmethod is deprecated since Python 3.16 and will raise TypeError in Python 3.18. Annotate the dispatch parameter or pass the dispatch type explicitly instead. (Contributed by Bartosz Sławecki in gh-143465.)