save project

diy2.py

@@ -6,9 +6,9 @@ while True:
     if name == username and password == userpassword:
         print("登录成功!")
         break
-    if name!=username:
+    elif name!= username: 
         print("此账号不存在")
-    if password!=userpassword:
+    else:
         print("密码输入错误")