diff --git a/python/xoscar/collective/gloo/test/test_pygloo.py b/python/xoscar/collective/gloo/test/test_pygloo.py
index 2c4b0573..ca1bf5d7 100644
--- a/python/xoscar/collective/gloo/test/test_pygloo.py
+++ b/python/xoscar/collective/gloo/test/test_pygloo.py
@@ -10,6 +10,7 @@
 fileStore_path = "./collective"
 system_name = platform.system()
 
+
 def worker_allgather(rank):
     from .. import xoscar_pygloo as xp
 
diff --git a/python/xoscar/collective/test/test_pygloo_tcp_store.py b/python/xoscar/collective/test/test_pygloo_tcp_store.py
index e285fb51..f72a88b9 100644
--- a/python/xoscar/collective/test/test_pygloo_tcp_store.py
+++ b/python/xoscar/collective/test/test_pygloo_tcp_store.py
@@ -11,6 +11,7 @@
 fileStore_path = "./collective"
 system_name = platform.system()
 
+
 def worker_allgather(rank):
     from ..gloo import xoscar_pygloo as xp
     from ..rendezvous import xoscar_store as xs