docs: def set_input_type(self, type_or_parse):
          """ Set an unique input type.
  
          If you use this then you have only one input for the play.
          """
          self._inputs = OrderedDict()
          default_inputs = self.engine.in_name
          if len(default_inputs) > 1:
              raise ValueError("Need more than one input, you sould use `add_input` for each of them")
          self.add_input(default_inputs[0], type_or_parse)