code: def by_median_household_income(self,
                                     lower=-1,
                                     upper=2 ** 31,
                                     zipcode_type=ZipcodeType.Standard,
                                     sort_by=SimpleZipcode.median_household_income.name,
                                     ascending=False,
                                     returns=DEFAULT_LIMIT):
          
          return self.query(
              median_household_income_lower=lower,
              median_household_income_upper=upper,
              sort_by=sort_by, zipcode_type=zipcode_type,
              ascending=ascending, returns=returns,
          )
docs: Search zipcode information by median household income.