[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

batchspawner/singleuser.py

@@ -1,6 +1,5 @@
 import os
 import sys
-
 from runpy import run_path
 from shutil import which
 from urllib.parse import urlparse
@@ -39,9 +38,9 @@ def main(argv=None):
     url = urlparse(os.environ.get("JUPYTERHUB_SERVICE_URL", ""))
     # Updated URL. We are effectively passing the port arg via env var
     if url.hostname:
-        os.environ[
-            "JUPYTERHUB_SERVICE_URL"
-        ] = f"{url.scheme}://{url.hostname}:{port}{url.path}"
+        os.environ["JUPYTERHUB_SERVICE_URL"] = (
+            f"{url.scheme}://{url.hostname}:{port}{url.path}"
+        )
 
     cmd_path = which(sys.argv[1])
     sys.argv = sys.argv[1:]