Input() 未能为名称赋值

Question

我正在构建一个相当大的函数，它需要用户在开始时使用pick 和input 输入。我正在 python 终端中使用 python 3.8。

我正在使用last_6 = input("What is your average milage for the last 6 weeks?) 将用户输入值分配给名称last_6。当我调用该函数时，我被要求输入值，但随后该函数无法进入下一步。

调用现在应该返回输入值last_6 的名称会导致错误消息

NameError: name 'last_6' not is not defined .

函数的第一部分，直到发生错误可以在这里看到：

def milage_calc():
    title = 'What event are you training for?'
    options = [ '800', '1500/mile','3k/2mile', '5k', '10k', 'Half Marathon', 'Marathon' ]
    event = pick(options, title, multiselect= False)

    event_dict = {'800': 0.7, '1500/mile': 0.75,'3k/2mile': 0.8, '5k': 0.9, '10k': 1 , 'Half Marathon': 1.1, 'Marathon': 1.2, }
    event_modifier = event_dict[event[0]]

    weeks = list(range(1,20,1))
    _20_weeks_milage = {}


    last_6 = input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:")

终端显示what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:。

然后我输入答案，然后回车。但该功能的其余部分没有运行。当我调用与输入值last_6 关联的名称时，我只得到NameError: name 'last_6' is not defined。

完整的功能可以在这里看到：

def milage_calc() :
    title = 'What event are you training for?'
    options = [ '800', '1500/mile','3k/2mile', '5k', '10k', 'Half Marathon', 'Marathon' ]
    event = pick(options, title, multiselect= False)

    event_dict = {'800': 0.7, '1500/mile': 0.75,'3k/2mile': 0.8, '5k': 0.9, '10k': 1 , 'Half Marathon': 1.1, 'Marathon': 1.2, }
    event_modifier = event_dict[event[0]]

    weeks = list(range(1,20,1))
    _20_weeks_milage = {}


    last_6 = input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:")

    # check that milage input is in the right format
    while type(last_6) != int:
        print("You didn't input your milage as a whole number, please try again.")
        last_6 = int(input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:" ))

    if 0 > last_6 or 100 < last_6:
        print("Please re-enter your milage to confirm that it is correct")
        last_6_2 = input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:")

    if last_6_2 == last_6:
        None
    else:
        print("Your entries did not match. Please re-enter your milage to confirm that it is correct. Becareful because your training plan will \n be created using the milage you enter this time")
        last_6 = input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:")
        # User inputs the ave. milage per week for their biggest 6 weeks of the last year

    best_6 = input("In the last year, what is your highest 6 week average milage? Please give your answer as a whole number:")

    # check that milage input is in the right format
    while type(best_6) != int:
        print("You didn't input your milage as a whole number, please try again.")
        best_6 = input("In the last year, what is your highest 6 week average milage? Please give your answer as a whole number:")

    if 0 > best_6 or 100 < best_6:
        print("Please re-enter your milage to confirm that it is correct")
        best_6_2 = input("In the last year, what is your highest 6 week average milage? Please give your answer as a whole number:")
    if best_6_2 == best_6:
        None
    else:
        print("Your entries did not match. Please re-enter your milage to confirm that it is correct. Becareful because your training plan will \n be created using the milage you enter this time")
        best_6 = input("what is your average weekly milage over the last 6 weeks? Please give your answer as a whole number:")

    # Calculating the milage for each week of the 20 weeks of the training plan.
    for x in weeks:
        if x in [1,2,3]:
            _20_weeks_milage[x] = 10 + 0.9*((last_6)+x*0.2*(best_6 - last_6))

        elif x in [4,8,12,16]:
            _20_weeks_milage[x]= 0.75*_20_weeks_milage[(x-1)]
        elif x in [5,6,7,9,10,11,13]:
            _20_weeks_milage[x]= best_6 + 3*(x-5)
        elif x in [14,15,17,18]:
            _20_weeks_milage[x]= (_20_weeks_milage[13]-((1.5*x)-13))*event_modifier
        else :
            _20_weeks_milage[x]= (_20_weeks_milage[16]*(0.50+((20-x)*0.125)))*event_modifier

    return print(_20_weeks_milage)

Answer 1

正如弗兰克所说，input() 总是返回一个字符串，这会使你的循环失败。要检查您的输入是否可以安全地转换为整数，您可以使用.isdigit() 方法。但是，这仅适用于整数。考虑到这一点，这是重写代码的第一个循环：

last_6 = input("what is your average weekly milage over the last 6 weeks? " 
"Please give your answer as a whole number:")

# check that milage input is in the right format
while not last_6.isdigit():
    print("You didn't input your milage as a whole number, please try again.")
    last_6 = input("what is your average weekly milage over the last 6 weeks? "
    "Please give your answer as a whole number:")
last_6 = int(last_6)

另外，您发布的代码格式不正确，我不得不猜测一些缩进...