code: def parent_dir(path):
      '''Return the parent of a directory.'''
      return os.path.abspath(os.path.join(path, os.pardir, os.pardir, '_build')f parent_dir(path):
      '''Return the parent of a directory.'''
      return os.path.abspath(os.path.join(path, os.pardir, os.pardir, '_build'))
docs: Return the parent of a directory.