auto save

diy2.py

-i=10
 username = "python"
 userpassword = "123456"
 while True:
-    if i>0:
     name = input("请输入用户名:")
     password = input("请输入密码:")
-        i=i-1
     if name == username and password == userpassword:
         print("登录成功!")
         break
-        if name != usernamei
+    if name != username
     print("用户名不存在!请重新输入")
     if password != userpassword
     print("密码错误，请重新输入")