save project

diy1.py

@@ -5,7 +5,8 @@ while True:
     userpassword1=input('请输入密码')
     if username==username1 and userpassword==userpassword1:
         print('登录成功')
-    else:
-        print('用户名或密码错误')
-
+    if username!=username1:
+        print('用户名不存在,请重新输入')
+    if userpassword!=userpassword1:
+        print('密码错误，请重新输入')
     
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