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gh-117349: Micro-optimize a few os.path functions (#117350)

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Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Barney Gale <barney.gale@gmail.com>
Co-authored-by: Pieter Eendebak <pieter.eendebak@gmail.com>
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Nice Zombies 2024-04-02 22:32:35 +02:00 • committed by GitHub
parent 8eda146e87
commit cae4cdd07d
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4 changed files with 35 additions and 39 deletions
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43
Lib/posixpath.py
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@ -213,15 +213,8 @@ def ismount(path):
except (OSError, ValueError):
return False
dev1 = s1.st_dev
dev2 = s2.st_dev
if dev1 != dev2:
return True # path/.. on a different device as path
ino1 = s1.st_ino
ino2 = s2.st_ino
if ino1 == ino2:
return True # path/.. is the same i-node as path
return False
# path/.. on a different device as path or the same i-node as path
return s1.st_dev != s2.st_dev or s1.st_ino == s2.st_ino
# Expand paths beginning with '~' or '~user'.
@ -270,7 +263,7 @@ def expanduser(path):
return path
name = path[1:i]
if isinstance(name, bytes):
name = str(name, 'ASCII')
name = name.decode('ascii')
try:
pwent = pwd.getpwnam(name)
except KeyError:
@ -359,21 +352,19 @@ def normpath(path):
path = os.fspath(path)
if isinstance(path, bytes):
sep = b'/'
empty = b''
dot = b'.'
dotdot = b'..'
else:
sep = '/'
empty = ''
dot = '.'
dotdot = '..'
if path == empty:
if not path:
return dot
_, initial_slashes, path = splitroot(path)
comps = path.split(sep)
new_comps = []
for comp in comps:
if comp in (empty, dot):
if not comp or comp == dot:
continue
if (comp != dotdot or (not initial_slashes and not new_comps) or
(new_comps and new_comps[-1] == dotdot)):
@ -396,12 +387,12 @@ def normpath(path):
def abspath(path):
"""Return an absolute path."""
path = os.fspath(path)
if not isabs(path):
if isinstance(path, bytes):
cwd = os.getcwdb()
else:
cwd = os.getcwd()
path = join(cwd, path)
if isinstance(path, bytes):
if not path.startswith(b'/'):
path = join(os.getcwdb(), path)
else:
if not path.startswith('/'):
path = join(os.getcwd(), path)
return normpath(path)
@ -417,6 +408,7 @@ def realpath(filename, *, strict=False):
# Join two paths, normalizing and eliminating any symbolic links
# encountered in the second path.
# Two leading slashes are replaced by a single slash.
def _joinrealpath(path, rest, strict, seen):
if isinstance(path, bytes):
sep = b'/'
@ -427,7 +419,7 @@ def _joinrealpath(path, rest, strict, seen):
curdir = '.'
pardir = '..'
if isabs(rest):
if rest.startswith(sep):
rest = rest[1:]
path = sep
@ -439,10 +431,15 @@ def _joinrealpath(path, rest, strict, seen):
if name == pardir:
# parent dir
if path:
path, name = split(path)
parent, name = split(path)
if name == pardir:
path = join(path, pardir, pardir)
# ../..
path = join(path, pardir)
else:
# foo/bar/.. -> foo
path = parent
else:
# ..
path = pardir
continue
newpath = join(path, name)