save project

diy2.py

@@ -6,7 +6,7 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!= username:
+    elif name!= username:
         print("此用户不存在，请重新输入！")
-    if password!= userpassword:
-        print("密码不正确，请重新输入！")
\ No newline at end of file
+    else:
+        print("密码不正确，请重新输入！")