用python写登陆界面

端午佳节，一边吃粽子一边写登陆界面

#!/usr/bin/env pythondef login(username, password):    f = open("db", 'r')  # 读文件    for line in f:        l1 = line.split("|")        if l1[0] == username and l1[1] == password:            return True    return Falsedef regedit(username, password):    f = open("db", 'a')  # a表示添加    temp = "\n" + username + "|" + password    f.write(temp)    f.close()def main():    a = input("1:登陆，2：注册")    if a == "1":        username = input("请输入用户名：")        password = input("请输入密码：")        r = login(username, password)        if r == True:            print("登陆成功")        else:            print("登陆失败")    elif a == "2":        print("注册")        user = input("请输入用户名：")        passwd = input("请输入密码：")        regedit(user, passwd)main()