code: def from_array(array):
          
          data = super(DownloadableMedia).from_array(array)
          data["file_id"] = array.get("file_id")
          data["file_size"] = array.get("file_size")  # can be None
          return data
docs: Subclass for all :class:`Media` which has a :py:attr:`file_id` and optionally a :py:attr:`file_size`
          :param array: a array to parse
          :type  array: dict
          :return: a dict with file_id and file_size extracted from the array
          :rtype: dict