code: def save_to_internal(self, data):
          
          if self.filetype is "pickle":
              pickle.dump(data, open(self.location_internal, "wb"))
          elif self.filetype is "hickle":
              import hickle
              hickle.dump(data, open(self.location_internal, "wb"))
          else:
              raise ValueError(
                  "Invalid filetype {} (must be {} or {})".format(
                      self.filetype, "pickle", "hickle"
                  )
              )
docs: save