def __add__(self, other_model):
warn('<STR_LIT>', DeprecationWarning)<EOL>return self.merge(other_model, objective='<STR_LIT>', inplace=False)<EOL>
Add the content of another model to this model (+).

        The model is copied as a new object, with a new model identifier,
        and copies of all the reactions in the other model are added to this
        model. The objective is the sum of the objective expressions for the
        two models.