save project

diy2.py

@@ -6,5 +6,9 @@ while True:
     if username==name and userpassword==password:
         print("登录成功")
         break
-    print("用户名或密码错误！请重新输入")    
+    if username != name:
+        print("用户名不存在，请重新输入！")
+        continue   
+    if userpassword != password:
+        print("密码输入有误，请重新输入！")    
 print("欢迎来到贝尔编程")
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