save project

diy1.py

+i = 3
 username = "python"
 userpassword = "123456"
 while tree:
+    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
@@ -10,4 +13,5 @@ while tree:
         print("用户名不存在，请重新输入")
     else;
         print("密码输入有误，请重新输入")
+        exit()
 print("欢迎来到贝尔编程!")
\ No newline at end of file