code: def file(self, md5=None, sha1=None, sha256=None, **kwargs):
          
          indicator_obj = File(md5, sha1, sha256, **kwargs)
          return self._indicator(indicator_obj)
docs: Add File data to Batch object.
  
          .. note:: A least one file hash value must be specified.
  
          Args:
              md5 (str, optional): The md5 value for this Indicator.
              sha1 (str, optional): The sha1 value for this Indicator.
              sha256 (str, optional): The sha256 value for this Indicator.
              confidence (str, kwargs): The threat confidence for this Indicator.
              date_added (str, kwargs): The date timestamp the Indicator was created.
              last_modified (str, kwargs): The date timestamp the Indicator was last modified.
              rating (str, kwargs): The threat rating for this Indicator.
              size (str, kwargs): The file size for this Indicator.
              xid (str, kwargs): The external id for this Indicator.
  
          Returns:
              obj: An instance of File.