diff --git a/pre_commit/xargs.py b/pre_commit/xargs.py
index 1b6e06fb..8fa92b46 100644
--- a/pre_commit/xargs.py
+++ b/pre_commit/xargs.py
@@ -175,9 +175,9 @@ def xargs(
         )
     if dry_run:
         for run_cmd in partitions:
-            print("DRY RUN EXEC: ", " ".join(run_cmd))
+            print('DRY RUN EXEC: ', ' '.join(run_cmd))
         retcode = 0
-        stdout = b""
+        stdout = b''
     else:
         threads = min(len(partitions), target_concurrency)
         with _thread_mapper(threads) as thread_map:
diff --git a/testing/language_helpers.py b/testing/language_helpers.py
index e7039414..37d29069 100644
--- a/testing/language_helpers.py
+++ b/testing/language_helpers.py
@@ -18,7 +18,7 @@ def run_language(
         is_local: bool = False,
         require_serial: bool = True,
         color: bool = False,
-        dry_run: bool = False
+        dry_run: bool = False,
 ) -> tuple[int, bytes]:
     prefix = Prefix(str(path))
     version = version or language.get_default_version()