为什么我的程序菜单卡在无限循环中？

Question

我正在创建一个程序，以便田径教练可以轻松地拉起跑步者的时间并输入它们。

我试图弄清楚为什么当我启动我的程序时，它运行 function 'MENU'，循环它。

user_input = 0

print('MENU')
print('1 - Add runner data to file')
print('2 - Display runners and their times')
print('3 - Calculate the average run time')
print('4 - Display the fastest time')
print('5 - EXIT')
print()

def MENU():
    user_input = int(input('Enter your Menu choice >> '))
    return -1

def DATA(f_runner, f_time):
    f_runner = str(input('Enter runners name >> '))
    f_time = str(input('Enter the runners time in hours >> '))
    print('Runners data entered into the file.')
    f = open('myFile.txt', 'w')
    f.write(str(f_runner))
    f.write(str(f_time))
    f.close()
    return f_runner, f_time

def DISPLAY():
    contents = f.readlines()
    f = open('myFile.txt')
    print(contents)

runners_data = 0
runner = 0
runner_time = 0
average_time = 0
file_runner = ''
file_time = 0.0
contents = ''
program_exit = False
menu_start = 0

while program_exit == False:
    menu_start = MENU()
    while user_input > 0 and user_input < 6:
        if user_input == '1':
            DATA(file_runner, file_time)
        elif user_input == '2':
            Display()
        elif user_input == '5':
            program_exit = True

Answer 1

您在 MENU() 中返回 -1 而不是 user_input

Answer 2

除了 Samraj 所说的之外，我相信这也是因为您的 if 语句正在比较用户输入是否作为字符串返回，而您希望用户返回一个 int。 你可以把它从底部移除，让它在菜单中运行，然后调用 MENU()。

试试这个并将其编辑为您需要的内容

print('MENU')
print('1 - Add runner data to file')
print('2 - Display runners and their times')
print('3 - Calculate the average run time')
print('4 - Display the fastest time')
print('5 - EXIT')
print()

def MENU():
    the_input = int(input('Enter your Menu choice >> '))
    if the_input == 1:
        print("hello")
        DATA(file_runner, file_time)
    elif the_input == 2:
        Display()
    elif the_input == 5:
        exit()
    return the_input

def DATA(f_runner, f_time):
    f_runner = str(input('Enter runners name >> '))
    f_time = str(input('Enter the runners time in hours >> '))
    print('Runners data entered into the file.')
    f = open('myFile.txt', 'w')
    f.write(str(f_runner))
    f.write(str(f_time))
    f.close()
    return f_runner, f_time

def DISPLAY():
    contents = f.readlines()
    f = open('myFile.txt')
    print(contents)

runners_data = 0
runner = 0
runner_time = 0
average_time = 0
file_runner = ''
file_time = 0.0
contents = ''
program_exit = False
menu_start = 0

MENU()