python-3.x - Python 3 使用字典的登录程序

Question

我正在尝试为一个项目创建一个登录程序，但我似乎无法弄清楚两件事。第一个是退出程序后如何将登录信息存储在字典中，第二个是弄清楚如何正确退出程序。谢谢!这是源代码。

#Dictionary
users = {}
#Used to quit/create/login users
status = ""
#Start Menu:Ask if user exists or create new user
def Display_Menu():
    status =input("Are you a registered user? (Yes/No)? Press q to quit: ")
    if status == "Yes":
        Old_User()
    elif status == "No":
        New_User()
#Creates New User
def New_User():
    Create_Login =input("Create login name: ")
    if Create_Login in users:
        print ("Login name already exist!")
    else:
        Create_Password =input("Create password: ")
        users[Create_Login] = Create_Password
        print("New User created!")     
#Login if old user
def Old_User():
    login =input("Enter login name: ")
    Password =input("Enter password: ")

    if login in users and users[login] == Password:
        print("Login successful!")
    else:
        print("User doesn't exist or wrong password!")
#Quits Program
if status == "q":
    exit()
while status !="q":
    Display_Menu()

Answer 1

嗯，Python程序不会将数据存储在内存中，所以我想说，你应该创建一个login_data.txt。

代码可能看起来像这样

import json # may not be required as per storing method

#Dictionary
with open("login_data.txt", "r") as login_file:
    try:
        users = json.load(login_file)
    except:
        users = {}
#Used to quit/create/login users
status = ""
#Start Menu:Ask if user exists or create new user
def Display_Menu():
    status =input("Are you a registered user? (Yes/No)? Press q to quit: ")
    if status == "Yes":
        Old_User()
    elif status == "No":
        New_User()
#Creates New User
def New_User():
    Create_Login =input("Create login name: ")
    if Create_Login in users:
        print ("Login name already exist!")
    else:
        Create_Password =input("Create password: ")
        users[Create_Login] = Create_Password
        print("New User created!")     
#Login if old user
def Old_User():
    login =input("Enter login name: ")
    Password =input("Enter password: ")

    if login in users and users[login] == Password:
        print("Login successful!")
    else:
        print("User doesn't exist or wrong password!")
#Quits Program (modified)
while True:
    if status in {"q", "Q"}:
        # store the data before quitting
        with open("login_data.txt", "w") as login_file:
            json.dump(users, login_file)
        break
    else:
        Display_Menu()

至于退出，Python程序执行完所有代码后自动退出。因此，在遇到 break 语句后，程序会脱离 while 循环，并且由于之后没有更多代码，程序会自动退出。