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GH-103548: Improve performance ofpathlib.Path.[is_]absolute()#103549

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Merged
barneygale merged 10 commits intopython:mainfrombarneygale:gh-103548-absolute-perf
May 6, 2023
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GH-103548: Improve performance ofpathlib.Path.[is_]absolute()
Pass the *unnormalized* path to `os.path.isabs()`.When making an empty path absolute, avoid calling `os.path.join()`, andprevent pathlib from later re-normalizing the result of `os.getcwd()` bystoring it as `path._str`.
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@barneygale
barneygale committedApr 14, 2023
commit871dbdb455ee4b3aa6f77a22613b3719b1ccf8c9
9 changes: 7 additions & 2 deletionsLib/pathlib.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -650,7 +650,7 @@ def is_absolute(self):
# 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
Expand DownExpand Up@@ -857,8 +857,13 @@ def absolute(self):
elif self.drive:
# There is a CWD on each drive-letter drive.
cwd = self._flavour.abspath(self.drive)
else:
elif self._tail:
cwd = os.getcwd()
else:
path_str = os.getcwd()
path = type(self)(path_str)
path._str = path_str # Fully normalized string from getcwd().
return path
return type(self)(cwd, self._raw_path)

def resolve(self, strict=False):
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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,3 @@
Improve performance of:meth:`pathlib.PurePath.is_absolute` and
:meth:`pathlib.Path.absolute` by working with unnormalized paths and
avoiding unnecessary joining.

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