Add YAPF style + ignore, and format tracked Python files

ProviderCore/download.py

@@ -28,7 +28,10 @@ def download_file(
     *,
     session: Optional[requests.Session] = None,
     timeout_s: float = 30.0,
-    progress_callback: Optional[Callable[[int, Optional[int], str], None]] = None,
+    progress_callback: Optional[Callable[[int,
+                                          Optional[int],
+                                          str],
+                                         None]] = None,
 ) -> bool:
     output_path = Path(output_path)
     output_path.parent.mkdir(parents=True, exist_ok=True)
@@ -69,7 +72,10 @@ def download_file(
                                 progress_callback(downloaded, total, label)
                             elif bar is not None:
                                 bar.update(
-                                    downloaded=downloaded, total=total, label=label, file=sys.stderr
+                                    downloaded=downloaded,
+                                    total=total,
+                                    label=label,
+                                    file=sys.stderr
                                 )
                         except Exception:
                             pass