diff --git a/tools/ci/check_all.py b/tools/ci/check_all.py
index 7ac5b3c7..3c986f04 100644
--- a/tools/ci/check_all.py
+++ b/tools/ci/check_all.py
@@ -72,4 +72,4 @@ def check_linter():
 if __name__ == "__main__":
     if not check_all():
         exit(1)
-    exit(0)
\ No newline at end of file
+    exit(0)
diff --git a/vnpy/gateway/ctp/ctp_gateway.py b/vnpy/gateway/ctp/ctp_gateway.py
index d0030f62..56911bd6 100644
--- a/vnpy/gateway/ctp/ctp_gateway.py
+++ b/vnpy/gateway/ctp/ctp_gateway.py
@@ -767,4 +767,4 @@ class CtpTdApi(TdApi):
     def close(self):
         """"""
         if self.connect_status:
-            self.exit()
\ No newline at end of file
+            self.exit()