code: def _find_parent_directory(directory, filename):
          
          parent_directory = directory
          absolute_directory = '.'
          while absolute_directory != os.path.abspath(parent_directory):
              absolute_directory = os.path.abspath(parent_directory)
              if os.path.isfile(os.path.join(absolute_directory, filename)):
                  return absolute_directory
              if os.path.isabs(parent_directory):
                  parent_directory = os.path.join(os.path.dirname(parent_directory), '..',
                                                  os.path.basename(parent_directory))
              else:
                  parent_directory = os.path.join('..', parent_directory)
          return os.path.abspath(directory)
docs: Find a directory in parent tree with a specific filename
  
          :param directory: directory name to find
          :param filename: filename to find
          :returns: absolute directory path