code: def fixed_terms(self):
          '''Return dict of all and only fixed effects in model.'''
          return {k: v for (k, v) in self.terms.items() if not v.randomf fixed_terms(self):
          '''Return dict of all and only fixed effects in model.'''
          return {k: v for (k, v) in self.terms.items() if not v.random}
docs: Return dict of all and only fixed effects in model.