diff --git a/ipykernel/ipkernel.py b/ipykernel/ipkernel.py
index 2f3e0ba77..2563c774c 100644
--- a/ipykernel/ipkernel.py
+++ b/ipykernel/ipkernel.py
@@ -49,7 +49,7 @@ def _create_comm(*args, **kwargs):
 
 # there can only be one comm manager in a ipykernel process
 lock = threading.Lock()
-comm_manager : t.Optional[CommManager] = None
+comm_manager: t.Optional[CommManager] = None
 
 
 def _get_comm_manager(*args, **kwargs):
diff --git a/ipykernel/tests/test_comm.py b/ipykernel/tests/test_comm.py
index fe4c2aef2..5878b5ad9 100644
--- a/ipykernel/tests/test_comm.py
+++ b/ipykernel/tests/test_comm.py
@@ -1,7 +1,9 @@
 from ipykernel.comm import Comm
-from .utils import kernel
 from ipykernel.ipkernel import IPythonKernel
 
+from .utils import kernel
+
+
 async def test_comm(kernel):
     c = Comm()
     c.kernel = kernel  # type:ignore