diff --git a/python/langsmith/_internal/_background_thread.py b/python/langsmith/_internal/_background_thread.py
index a856df557..2e8c599d3 100644
--- a/python/langsmith/_internal/_background_thread.py
+++ b/python/langsmith/_internal/_background_thread.py
@@ -114,9 +114,7 @@ def _tracing_thread_drain_compressed_buffer(
         client.compressed_runs_buffer = io.BytesIO()
         client.compressor_writer = zstd.ZstdCompressor(
             level=3, threads=-1
-        ).stream_writer(
-            client.compressed_runs_buffer, closefd=False
-        )
+        ).stream_writer(client.compressed_runs_buffer, closefd=False)
         client._run_count = 0
 
     filled_buffer.seek(0)
@@ -234,23 +232,26 @@ def keep_thread_active() -> bool:
     ):
         _tracing_thread_handle_batch(client, tracing_queue, next_batch, use_multipart)
 
+
 def _worker_thread_func(client: Client, request_queue: Queue) -> None:
     while True:
         try:
             data_stream = request_queue.get()
-            
+
             if data_stream is None:
                 break
-            
+
             client._send_compressed_multipart_req(data_stream)
-            
+
         except Exception:
             logger.error("Error in worker thread processing request", exc_info=True)
         finally:
             request_queue.task_done()
 
-def tracing_control_thread_func_compress_parallel(client_ref: weakref.ref[Client]
-                                                  ) -> None:
+
+def tracing_control_thread_func_compress_parallel(
+    client_ref: weakref.ref[Client],
+) -> None:
     client = client_ref()
     if client is None:
         return
@@ -263,7 +264,7 @@ def tracing_control_thread_func_compress_parallel(client_ref: weakref.ref[Client
     num_workers = min(4, os.cpu_count())
     request_queue: Queue = Queue(maxsize=num_workers * 2)
     workers = []
-    
+
     for _ in range(num_workers):
         worker = threading.Thread(
             target=_worker_thread_func,