diff --git a/jupytercad_freecad/handlers.py b/jupytercad_freecad/handlers.py
index 3c329bf..771b668 100644
--- a/jupytercad_freecad/handlers.py
+++ b/jupytercad_freecad/handlers.py
@@ -1,6 +1,5 @@
 import json
 import base64
-import tempfile
 from pathlib import Path
 
 from jupyter_server.base.handlers import APIHandler
@@ -9,6 +8,7 @@
 
 from jupytercad_freecad.freecad.loader import FCStd
 
+
 class BackendCheckHandler(APIHandler):
     @tornado.web.authenticated
     def post(self):
@@ -26,6 +26,7 @@ def post(self):
         else:
             self.finish(json.dumps({"installed": False}))
 
+
 class JCadExportHandler(APIHandler):
     @tornado.web.authenticated
     def post(self):
@@ -81,6 +82,14 @@ def setup_handlers(web_app):
 
     base_url = web_app.settings["base_url"]
 
-    handlers = [(url_path_join(base_url, "jupytercad_freecad", "backend-check"), BackendCheckHandler), 
-                (url_path_join(base_url, "jupytercad_freecad", "export-jcad"), JCadExportHandler)]
+    handlers = [
+        (
+            url_path_join(base_url, "jupytercad_freecad", "backend-check"),
+            BackendCheckHandler,
+        ),
+        (
+            url_path_join(base_url, "jupytercad_freecad", "export-jcad"),
+            JCadExportHandler,
+        ),
+    ]
     web_app.add_handlers(host_pattern, handlers)