save project

diy2.py

@@ -7,6 +7,10 @@ while True:
         print("登录成功!")
         break
     if name !=userpassword:
-        print("")    
+        print("用户名错误")    
+        continue
+    if password != userpassword:
+        print("密码错误")    
+    print("错误，重输！")
     print("用户名和密码错误!请重新输入")
 print("欢迎来到贝尔编程!")
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