save project

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 :
         if password == userpassword:
            print("登录成功!")
@@ -11,3 +13,6 @@ while True:
            print("密码错误!")
         else:
            print("用户名不存在!")
+    if i == 0:
+        print("账号已被锁定!")
+        exit()