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

common Files and subdirectories in both a and b.

right The directory b.

shutil.chown(path, user=None, group=None) Change owner user and/or group of the given path.

PurePath.stem The final path component, without its suffix:

Path.open(mode='r', buffering=-1, encoding=None, errors=None, newline=None) Open the file pointed to by the path, like the built-in

Path.write_text(data, encoding=None, errors=None) Open the file pointed to in text mode, write data to it, and close

left The directory a.

fileinput.filelineno() Return the line number in the current file. Before the first line has been read, returns 0

class filecmp.dircmp(a, b, ignore=None, hide=None) Construct a new directory comparison object, to compare the directories a