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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _instantiate_model(self, response, attrs, additional_properties=None):
 """Instantiate a response model passing in deserialized args. :param response: The response model class. :param d_attrs: The deserialized response attributes. """

        if callable(response):
            subtype = getattr(response, '_subtype_map', {})
            try:
                readonly = [k for k, v in response._validation.items()
                            if v.get('readonly')]
                const = [k for k, v in response._validation.items()
                         if v.get('constant')]
                kwargs = {k: v for k, v in attrs.items()
                          if k not in subtype and k not in readonly + const}
                response_obj = response(**kwargs)
                for attr in readonly:
                    setattr(response_obj, attr, attrs.get(attr))
                if additional_properties:
                    response_obj.additional_properties = additional_properties
                return response_obj
            except TypeError as err:
                msg = "Unable to deserialize {} into model {}. ".format(
                    kwargs, response)
                raise DeserializationError(msg + str(err))
        else:
            try:
                for attr, value in attrs.items():
                    setattr(response, attr, value)
                return response
            except Exception as exp:
                msg = "Unable to populate response model. "
                msg += "Type: {}, Error: {}".format(type(response), exp)
                raise DeserializationError(msg)