os.path.normpath(path) Normalize a pathname by collapsing redundant separators and up-level references so that A//B

os.path.islink(path) Return True if path refers to a directory entry that is a symbolic link. Always False

stat.filemode(mode) Convert a file’s mode to a string of the form ‘-rwxrwxrwx’.

right_only Files and subdirectories only in b.

Path.unlink() Remove this file or symbolic link. If the path points to a directory, use Path.rmdir() instead.

fileinput.isfirstline() Returns true if the line just read is the first line of its file, otherwise returns false.

shutil.disk_usage(path) Return disk usage statistics about the given path as a named tuple

fnmatch.fnmatchcase(filename, pattern) Test whether filename matches pattern, returning

stat.S_ISBLK(mode) Return non-zero if the mode is from a block special device file.

left_list Files and subdirectories in a, filtered by hide and ignore.