diff --git a/src/quafu/users/userapi.py b/src/quafu/users/userapi.py
index 0694ac9..3aeedca 100644
--- a/src/quafu/users/userapi.py
+++ b/src/quafu/users/userapi.py
@@ -11,7 +11,7 @@ def __init__(self):
         self.apitoken = ""
         self._url = "http://quafu.baqis.ac.cn/"
         
-        if(self.check_account_data()):
+        if self.check_account_data():
             self.load_account()
             
         self.backends_api = "qbackend/get_backends/"