diff --git a/python/videoreader/__init__.py b/python/videoreader/__init__.py
index b8585f9..a162623 100755
--- a/python/videoreader/__init__.py
+++ b/python/videoreader/__init__.py
@@ -127,7 +127,9 @@ def seek_get_img(self, seek_idx: int) -> T | None:
 
     def set(self, arguments: list[str]) -> None:
         argv_keepalive = [ffi.new("char[]", arg.encode()) for arg in arguments]
-        if backend.videoreader_set(self._handler, argv_keepalive, len(argv_keepalive)):
+        if backend.videoreader_set(
+            self._handler, argv_keepalive, len(argv_keepalive)
+        ):
             raise_error()
 
 
@@ -187,7 +189,9 @@ def videoreader_n_frames(uri: str) -> int:
     Get number of frames in a file
     """
     handler = ffi.new("struct videoreader **")
-    backend.videoreader_create(handler, uri.encode("utf-8"), [], 0, ffi.NULL, ffi.NULL)
+    backend.videoreader_create(
+        handler, uri.encode("utf-8"), [], 0, ffi.NULL, ffi.NULL
+    )
     n_frames = ffi.new("uint64_t *")
     backend.videoreader_size(handler[0], n_frames)
     backend.videoreader_delete(handler[0])
diff --git a/python/videoreader/__main__.py b/python/videoreader/__main__.py
index 7acbe1d..044d376 100644
--- a/python/videoreader/__main__.py
+++ b/python/videoreader/__main__.py
@@ -5,7 +5,9 @@
 
 def main():
     parser = ArgumentParser()
-    default = Path(__file__).parents[2] / "test" / "big_buck_bunny_480p_1mb.mp4"
+    default = (
+        Path(__file__).parents[2] / "test" / "big_buck_bunny_480p_1mb.mp4"
+    )
     parser.add_argument("uri", nargs="?", default=default)
     parser.add_argument(
         "--backend", choices=["base", "numpy", "minimg"], default="base"
@@ -18,7 +20,9 @@ def main():
         case "base":
             from . import VideoReaderBase as VideoReader
 
-            fmt_image = lambda image: f"{image.width}x{image.height}x{image.channels}"
+            fmt_image = (
+                lambda image: f"{image.width}x{image.height}x{image.channels}"
+            )
 
         case "numpy":
             from .numpy import VideoReaderNumpy as VideoReader
diff --git a/python/videoreader/minimg.py b/python/videoreader/minimg.py
index 05e189b..5fd0651 100644
--- a/python/videoreader/minimg.py
+++ b/python/videoreader/minimg.py
@@ -11,7 +11,9 @@
 @ffi.callback("void (VRImage*, void*)")
 def alloc_callback_numpy(image: ffi.CData, self: ffi.CData) -> None:
     assert image.scalar_type == 0, f"non uint8 images not yet supported"
-    img = MinImg.empty(image.width, image.height, image.channels, mintype=TYP_UINT8)
+    img = MinImg.empty(
+        image.width, image.height, image.channels, mintype=TYP_UINT8
+    )
     image.data = img.data
     image.stride = img.stride
     address = int(ffi.cast("uintptr_t", image.data))
diff --git a/python/videoreader/numpy.py b/python/videoreader/numpy.py
index 60fe74f..89788bd 100644
--- a/python/videoreader/numpy.py
+++ b/python/videoreader/numpy.py
@@ -12,7 +12,9 @@
 def alloc_callback_numpy(image: ffi.CData, self: ffi.CData) -> None:
     assert image.scalar_type == 0, f"non uint8 images not yet supported"
     if image.channels == 3:
-        arr = np.empty((image.height, image.width, image.channels), dtype=np.uint8)
+        arr = np.empty(
+            (image.height, image.width, image.channels), dtype=np.uint8
+        )
         ai = arr.__array_interface__
         address = ai["data"][0]
         assert (