gh-136437: Make several functions in os.path pos-only (#136949)

Lib/genericpath.py

@@ -81,28 +81,28 @@ def isdevdrive(path):
     return False
 
 
-def getsize(filename):
+def getsize(filename, /):
     """Return the size of a file, reported by os.stat()."""
     return os.stat(filename).st_size
 
 
-def getmtime(filename):
+def getmtime(filename, /):
     """Return the last modification time of a file, reported by os.stat()."""
     return os.stat(filename).st_mtime
 
 
-def getatime(filename):
+def getatime(filename, /):
     """Return the last access time of a file, reported by os.stat()."""
     return os.stat(filename).st_atime
 
 
-def getctime(filename):
+def getctime(filename, /):
     """Return the metadata change time of a file, reported by os.stat()."""
     return os.stat(filename).st_ctime
 
 
 # Return the longest prefix of all list elements.
-def commonprefix(m):
+def commonprefix(m, /):
     "Given a list of pathnames, returns the longest common leading component"
     if not m: return ''
     # Some people pass in a list of pathname parts to operate in an OS-agnostic
@@ -120,14 +120,14 @@ def commonprefix(m):
 
 # Are two stat buffers (obtained from stat, fstat or lstat)
 # describing the same file?
-def samestat(s1, s2):
+def samestat(s1, s2, /):
     """Test whether two stat buffers reference the same file"""
     return (s1.st_ino == s2.st_ino and
             s1.st_dev == s2.st_dev)
 
 
 # Are two filenames really pointing to the same file?
-def samefile(f1, f2):
+def samefile(f1, f2, /):
     """Test whether two pathnames reference the same actual file or directory
 
     This is determined by the device number and i-node number and