脚本中的函数定义必须出现在文件的结尾。 请将 "HeatingCarbonEmissions" 函数定义后面的所有语句都移到第一个局部函数定义前面。

好的，以下是修改后的代码：

def HeatingCarbonEmissions(heating_type, energy_efficiency_rating):
    if heating_type == "gas":
        if energy_efficiency_rating == "A":
            return 0.18
        elif energy_efficiency_rating == "B":
            return 0.23
        elif energy_efficiency_rating == "C":
            return 0.27
        else:
            return 0.32
    elif heating_type == "electric":
        if energy_efficiency_rating == "A":
            return 0.22
        elif energy_efficiency_rating == "B":
            return 0.28
        elif energy_efficiency_rating == "C":
            return 0.33
        else:
            return 0.39
    else:
        return 0

def main():
    print("Welcome to the carbon emissions calculator!")
    print("This calculator will estimate the amount of carbon emissions generated by your household.")
    print("Please enter the following information:")

    num_people = int(input("Number of people in your household: "))
    num_cars = int(input("Number of cars owned by your household: "))
    miles_per_car = float(input("Average miles driven per car per year: "))
    public_transport_usage = int(input("Average usage of public transport per week (in hours): "))
    train_usage = int(input("Average train usage per week (in hours): "))
    bus_usage = int(input("Average bus usage per week (in hours): "))
    heating_type = input("Type of heating used in your household (gas/electric): ")
    energy_efficiency_rating = input("Energy efficiency rating of your heating system (A/B/C/D): ")

    total_carbon_emissions = CarCarbonEmissions(num_people, num_cars, miles_per_car) + PublicTransportCarbonEmissions(public_transport_usage) + TrainCarbonEmissions(train_usage) + BusCarbonEmissions(bus_usage) + HeatingCarbonEmissions(heating_type, energy_efficiency_rating)

    print("Your household generates an estimated", round(total_carbon_emissions, 2), "tonnes of carbon emissions per year.")

if __name__ == "__main__":
    main()