save project

diy2.py

@@ -7,10 +7,10 @@ while True:
         exit()
     nm = input("请输入用户名:")
     pw = input("请输入密码:")
+    i -= 1
     if nm == un and pw == up:
         print("登录成功!")
         break
     else:
         print("用户名或密码错误")
-        i = i-1
 print("欢迎来到贝尔编程!")