def city_code=(city_code)
      if city_code
        if city_code.is_a?(String)
          @city_code = city_code.strip.upcase.to_sym
        elsif city_code.is_a?(Symbol)
          @city_code = city_code.upcase
        end
      end
    end
def city_code=(city_code)
      if city_code
        if city_code.is_a?(String)
          @city_code = city_code.strip.upcase.to_sym
        elsif city_code.is_a?(Symbol)
          @city_code = city_code.upcase
        end
      end
    end
Internal: sets the three letter code for a place

 Returns nothing