Add YAPF style + ignore, and format tracked Python files

SYS/file_server.py

@@ -54,7 +54,8 @@ class FileServerHandler(SimpleHTTPRequestHandler):
                     self.send_header("Content-type", content_type)
                     self.send_header("Content-Length", str(len(file_content)))
                     self.send_header(
-                        "Content-Disposition", f'attachment; filename="{full_path.name}"'
+                        "Content-Disposition",
+                        f'attachment; filename="{full_path.name}"'
                     )
                     self.end_headers()
                     self.wfile.write(file_content)
@@ -118,7 +119,10 @@ def start_file_server(port: int = 8001) -> Optional[str]:
         _file_server = HTTPServer(server_address, FileServerHandler)
 
         # Start in daemon thread
-        _server_thread = threading.Thread(target=_file_server.serve_forever, daemon=True)
+        _server_thread = threading.Thread(
+            target=_file_server.serve_forever,
+            daemon=True
+        )
         _server_thread.start()
 
         logger.info(f"File server started on port {port}")