auto save

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
+
 while True:
+
     name = input("请输入用户名:")
     password = input("请输入密码:")
+    i=i-1
+    if i>0:    
         if name == username and password == userpassword:
             print("登录成功!")
             break
@@ -10,4 +15,4 @@ while True:
             print("用户名错误")
         if name==username and password!=userpassword:
             print("密码错误")
-print("欢迎来到贝尔编程!")
\ No newline at end of file
+    print("欢迎来到贝尔编程!")
\ No newline at end of file