save project

diy2.py

@@ -6,10 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!=username:
+    if name!=username and password==userpassword:
         print("用户名不存在,请重新输入!")
-        continue
-    if password!=userpassword:
+    if name==username and password!=userpassword:
         print("密码输入有误,请重新输入!")