save project

diy2.py

@@ -6,5 +6,8 @@ while True:
     if name == username and password == userpassword: 
     if name == username and password == userpassword: 
         print("登录成功!")
         print("登录成功!")
         break
         break
-   print("用户名和密码错误!请重新输入")
+    if name != username
+        print("用户名不存在,请重新输入用户名")
+    if password != userpassword
+        print("用户密码错误,请重新输入密码")         
 print("欢迎来到贝尔编程!")
 print("欢迎来到贝尔编程!")
\ No newline at end of file