save project

diy2.py

-username = "python"
+i=3
+iusername = "python"
 userpassword= "123456"
 while True:
+    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
@@ -11,4 +14,7 @@ while True:
             continue
         if password!=userpassword:
             print("用户不存在，请重新登录")
+    else:
+        print("次数已用完")
+        exit
 print("欢迎来到贝尔编程!")
\ No newline at end of file