docs: def _clean_filepath(self, filepath):
          """
          processes the filepath by checking if it is a directory or not
          and adding `.py` if not present.
          """
          if (os.path.isdir(filepath) and
                  os.path.isfile(os.path.join(filepath, '__init__.py'))):
  
              filepath = os.path.join(filepath, '__init__.py')
  
          if (not filepath.endswith('.py') and
                  os.path.isfile(filepath + '.py')):
              filepath += '.py'
          return filepath