Question

我是Python的新手，我可以在编程课上使用一些帮助。我想我差不多了，但是当我尝试运行我的主模块时，我一直得到“NameError：name'level_miles'未定义”。任何帮助将不胜感激！以下是我的计划。

def get_flights_purchased():
    flights_purchased = 0
    while flights_purchased is not int:
        try:
            flights_purchased = int(input("Please enter the number of flights that you purchased this month "))
        break
    except ValueError:
        print('That is not a number. Please provide a whole number')
    return flights_purchased

def calculate_flight_miles_earned(flights_purchased):
    flight_miles = 0
    if flights_purchased == 0:
        flight_miles = 100

    elif flights_purchased == 1:
        flight_miles = 5

    elif flights_purchased == 2:
        flight_miles = 15

    elif flights_purchased == 3:
        flight_miles = 30

    elif flights_purchased > 3:
        flight_miles = 60

def output_flight_tier(flight_miles):

    if flight_miles == 0:
        print("You haven't flown with us yet, so you don't have a flight tier.")
    elif flight_miles == 5:
        print("You are in the economy airline tier")
    elif flight_miles == 15:
        print(" You are in the MVP airline tier")
    elif flight_miles == 30:
        print("You are in the MVP GOLD airline tier")
    elif flight_miles > 30:
        print("You are in the MVP GOLD tier!")

def final_evaluation(flights, output_flight_tier):
    evaluation = ""
    if flights < 15:
        evaluation = "You are not a frequent flyer"
    elif flights > 15:
        evaluation = "You are a frequent flyer"
    return evaluation

def output_point(get_flights_purchased, calculate_flight_miles_earned, output_flight_tier, final_evaluation):

    print("The number of flights you have purchased is ", flights_purchased)
    print(" The total # of miles earned from flights you have purchased is ", flights)
    print("The final evaluation is", final_evaluation)

def main():
     flights_purchased = 0
     flight_miles = 0
     evaluation = ""
     flights_purchased = get_flights_purchased()
     flight_miles = calculate_flight_miles_earned(flights_purchased)
     output_flight_tier(flight_miles)
     evaluation = final_evaluation(flights, output_flight_tier)
     output_point(get_flights_purchased, calculate_flight_miles_earned,                output_flight_tier, final_evaluation)

main()

Answer 1

您错误地调用了第二个子程序。而不是：

flight_miles(calculate_flight_miles_earned)

它应该是：

calculate_flight_miles_earned(flights_purchased)

通常，当您调用函数时，它应采用以下形式：

return_value = function(parameter1, parameter2...)

您的代码有许多其他已发生此错误的实例，但使用上述格式应解决它们。如果您没有返回值，请致电

function(parameters)

Answer 2

添加到random.george 11的回答中，你从未真正定义过＆＃39; flight_miles＆＃39;在main中，仅在calculate_flight_miles_earned中。当您在main output_flight_tier = flight_miles IFS中再次拨打该值时，该值不会结转

Answer 3

返回超出了功能范围。

def get_flights_purchased():
    flights_purchased = 0
    while flights_purchased is not int:
         try:
            flights_purchased = int(input("Please enter the number of 
                                       flights that you purchased this 
                                       month "))
        break
    except ValueError:
        print('That is not a number. Please provide a whole number')
return flights_purchased

Answer 4

您的主要错误仍然是错误的函数调用。

例如，output_point接受一些参数，但在执行时不使用这些参数。

我已对您的代码进行了一些编辑，以便它可以正常工作，因为我认为这比尝试解释每个代码更简单。我在每次编辑之前对该行进行了评论，以便您了解代码出错的位置。

def get_flights_purchased():
    flights_purchased = -1
    # "int" is a type, so flights_purchased is not going to equal "int"
    while flights_purchased == -1:
        try:
            flights_purchased = int(input("Please enter the number of flights that you purchased this month "))
        except ValueError:
            print('That is not a number. Please provide a whole number')
    return flights_purchased

def calculate_flight_miles_earned(flights_purchased):
    flight_miles = 0
    if flights_purchased == 0:
        flight_miles = 100

    elif flights_purchased == 1:
        flight_miles = 5

    elif flights_purchased == 2:
        flight_miles = 15

    elif flights_purchased == 3:
        flight_miles = 30

    elif flights_purchased > 3:
        flight_miles = 60

    #critical line - if you do not return this value, flight_miles will not be in main
    return flight_miles

def output_flight_tier(flight_miles):

    if flight_miles == 0:
        print("You haven't flown with us yet, so you don't have a flight tier.")
    elif flight_miles == 5:
        print("You are in the economy airline tier")
    elif flight_miles == 15:
        print(" You are in the MVP airline tier")
    elif flight_miles == 30:
        print("You are in the MVP GOLD airline tier")
    elif flight_miles > 30:
        print("You are in the MVP GOLD tier!")

def final_evaluation(flights, output_flight_tier):
    evaluation = ""
    #need an equal sign in one of these two conditions, as if flights = 15, evaluation will remain ""
    #for example, if flights <= 15 instead of flights < 15
    if flights < 15:
        evaluation = "You are not a frequent flyer"
    elif flights > 15:
        evaluation = "You are a frequent flyer"
    return evaluation

# the parameters of the subprogram must match the values used in the subprogram
# the parameters should be values, not other subprograms
def output_point(flights_purchased, flights, final_evaluation):
    print("The number of flights you have purchased is ", flights_purchased)
    print(" The total # of miles earned from flights you have purchased is ", flights)
    print("The final evaluation is", final_evaluation)

def main():
     flights_purchased = 0
     flight_miles = 0
     evaluation = ""
     flights_purchased = get_flights_purchased()
     flight_miles = calculate_flight_miles_earned(flights_purchased)
     output_flight_tier(flight_miles)
     #changed flights to flight_miles
     evaluation = final_evaluation(flight_miles, output_flight_tier)
     #changed parameters to match the parameters of output_point
     output_point(flights_purchased, flight_miles, evaluation)

main()

在Python中计算航空公司排名 - NameError：名称未定义

4 个答案: