title: Python: Overwriting a directory with another directory containing the same files
body: <p>I'm trying to overwrite a directory with another directory that contains the same files.
  I've tried using distutils.dir_util.copy_tree(src, dst) but it tried to make a directory for dst instead.
  The objective is to overwrite the directory and its contents silently.
  Is there any other way to do so?</p>