如何使我的if语句偶尔运行一次

Question

我正在尝试为python中的类制作简化的模拟银行终端应用程序。 我正在努力做到这一点，以便如果他们有支票或储蓄帐户，就无法创建新帐户。 我尝试将cacc_check设置为if loop_set和while循环之外的全局变量。 当我尝试它时，它抱怨cacc_check在使用之前尚未初始化。 当我将cacc_check = in设置为if menu_choice == 1 ，它将在每次进入该循环时将其重置为0。 我不确定如何初始化cacc_check以免每次我进入该菜单时都不会将其重置为0，并且仍然可以在“ if acc_choice == 1和cacc_check！= 0”中使用它，以便任何帐户生成的号码不会被清除。 这就是我现在停留的地方：

import random
loop_set = 1

while loop_set < 5:

def homeScreen():
    print('Welcome to your bank application \n 1. Create Account \n 2. Make a Deposit \n 3. Make a Withdrawal \n'
          ' 4. View Accounts \n 5. View Transactions \n 6. Transfer Money \n 7. Loans \n 8. Close an Account')
    menu_choice = int(input('Please enter a number to select an option'))
    if menu_choice == 0:
        homeScreen()
    if menu_choice == 1:
        cacc_check = 0
        sacc_check = 
        print('Creating Account')
        name = str(input('Please enter your name: '))
        acc_choice = int(input('Type 1 for a checking account and 2 for a savings account'))
        if acc_choice == 1 and cacc_check == 0:
            cacc_num = random.randint(1000, 9999)
            cacc_check += 1
            print('Hello ', name, 'your checking account number is', cacc_num)
            homeScreen()
        if acc_choice == 1 and cacc_num != 0:
            print("It looks like you already have a checking account with us")
            homeScreen()
        if acc_choice == 2 and sacc_check == 0:
            sacc_num = random.randint(1000, 9999)
            print('Hello ', name, 'your savings account number is', sacc_num)

    if loop_set == 1:
        loop_set = loop_set + 1
        print('loop_set = ', loop_set)
        homeScreen()

我希望能够确保它只能在一次分配随机帐号的语句中运行，否则该帐号将在下次通过时被覆盖。 对于格式和优化不正确，我深表歉意。 我敢肯定，有更好的方法可以完成我想做的事情，但我仍在学习。 任何建议表示赞赏。

Answer 1

您需要将变量移动到while循环之前。 这样，每次循环运行时值都不会重置。 尝试类似：

import random

def homeScreen():
    print('Welcome to your bank application \n 1. Create Account \n 2. Make a Deposit \n 3. Make a Withdrawal \n'
          ' 4. View Accounts \n 5. View Transactions \n 6. Transfer Money \n 7. Loans \n 8. Close an Account')

def loopScreen():
    menu_choice = int(input('Please enter a number to select an option'))
    loop_set = 1
    cacc_check = 0
    sacc_check = 0

    while loop_set < 5:
        if menu_choice == 0:
            homeScreen()
        if menu_choice == 1:
            print('Creating Account')
            name = str(input('Please enter your name: '))
            acc_choice = int(input('Type 1 for a checking account and 2 for a savings account'))
            if acc_choice == 1 and cacc_check == 0:
                cacc_num = random.randint(1000, 9999)
                cacc_check += 1
                print('Hello ', name, 'your checking account number is', cacc_num)
                homeScreen()
            if acc_choice == 1 and cacc_num != 0:
                print("It looks like you already have a checking account with us")
                homeScreen()
            if acc_choice == 2 and sacc_check == 0:
                sacc_num = random.randint(1000, 9999)
                print('Hello ', name, 'your savings account number is', sacc_num)

        if loop_set == 1:
            loop_set = loop_set + 1
            print('loop_set = ', loop_set)
            homeScreen()


loopScreen()