auto save

diy2.py

-i=3
 username = "python"
 usepassword = "123456"
 while True:
-    if i>0
     name = input("请输入用户名:")
     password = input("请输入密码:")
-    i-=1
     if name == username and password == userpassword:
         print("登录成功!")
         break
     if name!=username:
         print("登录错误")
     if password!=usepassword:
-        print("登录错误")
-        exit()
-    print("欢迎")        
\ No newline at end of file
+        print("登录错误")
\ No newline at end of file