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1# Copyright: This module has been placed in the public domain.
2# Author: Adam Turner
4"""Private helpers for the ``typing`` module."""
6from __future__ import annotations
8TYPE_CHECKING = False
9if TYPE_CHECKING:
10 import sys
11 from collections.abc import Callable
12 from typing import Any, Final, TypeVar, final, overload
14 if sys.version_info[:2] >= (3, 11):
15 from typing import Self
16 else:
17 from typing_extensions import Self # NoQA: F401
19 if sys.version_info[:2] >= (3, 12):
20 from typing import TypeAlias
21 else:
22 from typing_extensions import TypeAlias # NoQA: F401
24 _F = TypeVar("_F", bound=Callable[..., Any])
25 _T = TypeVar('_T')
26else:
28 # Runtime replacement for ``typing.final``.
29 def final(f: _T) -> _T:
30 return f
32 def _overload_inner(*args, **kwds):
33 raise NotImplementedError
35 # Runtime replacement for ``typing.overload``.
36 def overload(func: _F) -> _F:
37 return _overload_inner
39__all__: Final = ('final', 'overload')