python登陆，注册小程序

 1 def login(username,password):
 2     '''
 3     用于用户登录
 4     :param username: 用户输入用户名
 5     :param password: 用户输入密码
 6     :return: True表示登陆成功
 7     '''
 8     f = open("db","r")
 9     for line in f:#一行一行检测
10         line_list = line.strip().split("|")
11         if line_list[0] == username and line_list[1]  == password:
12             return True
13 
14 def register(username,password):
15     '''
16     用户注册
17     :param username: 用户名
18     :param password: 密码
19     :return: 默认返回None
20     '''
21     f = open("db", "a")
22     temp = "
" + username + "|" +password
23     f.write(temp)
24     f.close()
25 
26 def main():
27     t = input("1:登陆 2:注册")
28     if t == "1":
29         user = input("请输入用户名:")
30         pwd = input("请输入密码:")
31         r = login(user,pwd)
32         if r:
33             print("登陆成功")
34         else:
35             print("登陆失败")
36     elif t == '2':
37         user = input("请输入用户名:")
38         pwd = input("请输入密码:")
39         register(user,pwd)
40 main()