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GH-103548: Improve performance of pathlib.Path.[is_]absolute() (GH-103549)

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Improve performance of `pathlib.Path.absolute()` and `cwd()` by joining paths only when necessary. Also improve
performance of `PurePath.is_absolute()` on Posix by skipping path parsing and normalization.
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Barney Gale 2023-05-06 19:03:07 +01:00 • committed by GitHub
parent 376137f6ec
commit de7f694e3c
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2 changed files with 14 additions and 1 deletions
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11
Lib/pathlib.py
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@ -664,7 +664,7 @@ class PurePath(object):
# ntpath.isabs() is defective - see GH-44626 .
if self._flavour is ntpath:
return bool(self.drive and self.root)
return self._flavour.isabs(self)
return self._flavour.isabs(self._raw_path)
def is_reserved(self):
"""Return True if the path contains one of the special names reserved
@ -873,6 +873,15 @@ class Path(PurePath):
cwd = self._flavour.abspath(self.drive)
else:
cwd = os.getcwd()
# Fast path for "empty" paths, e.g. Path("."), Path("") or Path().
# We pass only one argument to with_segments() to avoid the cost
# of joining, and we exploit the fact that getcwd() returns a
# fully-normalized string by storing it in _str. This is used to
# implement Path.cwd().
if not self.root and not self._tail:
result = self.with_segments(cwd)
result._str = cwd
return result
return self.with_segments(cwd, self)
def resolve(self, strict=False):