Question

当我使用选项2打印“客户”字典键时，即使我已经添加了客户，它也显示为[]。谁能帮助我了解问题出在哪里？

def main():
    import sys
    Clients = {}

    choice = input(" Click 1 to add another client\n Click 2 to Check a Clients Balance\n Click 3 to change a Clients Balance ")

    if choice == "1":
            name = input('Add a Client\'s name : ')
            Clients.update({name.rstrip("\n"):0})
            print(name)
            print(Clients.keys())
            main()
    elif choice == "2":
            print(Clients.keys())
            main()
    elif choice == "3":
            print('Do it later')
            main()
    else:
            print('Please choose again')
            main()

main()

Answer 1

您一次又一次地使用新字典来调用main，这称为递归。在这里，您应该使用while循环。

def main():
    clients = {}
    while True:
        choice = input("Click 1 to add another client\n Click 2 to Check a Clients Balance\n Click 3 to change a Clients Balance ")

        if choice == "1":
            name = input("Add a Client's name : ")
            clients[name.rstrip()] = 0
            print(name)
            print(clients.keys())
        elif choice == "2":
            print(clients.keys())
        elif choice == "3":
            print('Do it later')
        else:
            print('Please choose again')

main()

if语句中的字典无法正常工作

1 个答案: