gh-117639: Special case for "" & "." in posixpath.abspath()

Lib/posixpath.py

@@ -388,11 +388,17 @@ def abspath(path):
  """Return an absolute path."""
  path = os.fspath(path)
  if isinstance(path, bytes):
- if not path.startswith(b'/'):
- path = join(os.getcwdb(), path)
+ sep = b'/'
+ curdir = b'.'
+ getcwd = os.getcwdb
  else:
- if not path.startswith('/'):
- path = join(os.getcwd(), path)
+ sep = '/'
+ curdir = '.'
+ getcwd = os.getcwd
+ if not path.startswith(sep):
+ if not path or path == curdir:
+ return getcwd()
+ path = join(getcwd(), path)
  return normpath(path)
 
 

Misc/NEWS.d/next/Core and Builtins/2024-04-08-15-04-51.gh-issue-117639.ca4N3t.rst

@@ -0,0 +1 @@
+Speedup :func:`os.path.abspath()` by up to 13% on Unix for "" & ".".