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GH-101362: Check pathlib.Path flavour compatibility at import time (GH-101664)

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This saves a comparison in `pathlib.Path.__new__()` and reduces the time taken to run `Path()` by ~5%.

Automerge-Triggered-By: GH:AlexWaygood
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Barney Gale 2023-03-05 22:46:45 +00:00 • committed by GitHub
parent 3572c861d8
commit 3e60e0213e
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2 changed files with 13 additions and 5 deletions
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16
Lib/pathlib.py
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@ -707,11 +707,7 @@ class Path(PurePath):
warnings._deprecated("pathlib.PurePath(**kwargs)", msg, remove=(3, 14))
if cls is Path:
cls = WindowsPath if os.name == 'nt' else PosixPath
self = cls._from_parts(args)
if self._flavour is not os.path:
raise NotImplementedError("cannot instantiate %r on your system"
% (cls.__name__,))
return self
return cls._from_parts(args)
def _make_child_relpath(self, part):
# This is an optimization used for dir walking. `part` must be
@ -1261,9 +1257,19 @@ class PosixPath(Path, PurePosixPath):
"""
__slots__ = ()
if os.name == 'nt':
def __new__(cls, *args, **kwargs):
raise NotImplementedError(
f"cannot instantiate {cls.__name__!r} on your system")
class WindowsPath(Path, PureWindowsPath):
"""Path subclass for Windows systems.
On a Windows system, instantiating a Path should return this object.
"""
__slots__ = ()
if os.name != 'nt':
def __new__(cls, *args, **kwargs):
raise NotImplementedError(
f"cannot instantiate {cls.__name__!r} on your system")