auto save

diy2.py

 username = "python"
 userpassword = "123456"
 
-while True:
+i = 3
+while 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("账户错误!")
+        continue
+    if password != userpassword:
+        print("密码错误!")
     print("用户名和密码错误!请重新输入")
+if i <= 0:
+    print("锁定")
+    exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file