auto save

diy2.py

 username = "python"
 userpassword = "123456"
+i=3
 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
@@ -10,5 +13,8 @@ while True:
             print("帐号错误")
         if password!= userpassword: 
             print("密码错误")
-    print("用户名和密码错误!请重新输入)
+        print("用户名和密码错误!请重新输入")
+    else:
+        print("超过登录次数")
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file