diff --git a/aitviewer/renderables/markers.py b/aitviewer/renderables/markers.py
index ebab3ca..fce51f7 100644
--- a/aitviewer/renderables/markers.py
+++ b/aitviewer/renderables/markers.py
@@ -56,7 +56,6 @@ def __init__(
 
         # todo fix color bug
         for mi, marker_name in enumerate(self.markers_labels):
-
             if colors is not None:
                 color = tuple(colors[mi])
 
@@ -158,7 +157,6 @@ def from_synthetic(
         markers_array = synthetic_markers.marker_trajectory
 
         if fps_out is not None and abs(1 - fps_in / fps_out) > 1e-4:
-
             assert (
                 fps_in % fps_out == 0
             ), f"fps_out must be a interger divisor of fps_in, but got fps_in={fps_in} fps_out={fps_out}"
@@ -226,7 +224,6 @@ def from_SSM_pkl(
 
     @classmethod
     def from_file(cls, mocap_file, **kwargs):
-
         if mocap_file.endswith(".c3d"):
             return cls.from_c3d(mocap_file, **kwargs)
         elif mocap_file.endswith(".npz"):
diff --git a/aitviewer/renderables/osim.py b/aitviewer/renderables/osim.py
index c8a49a0..9c0d0d7 100644
--- a/aitviewer/renderables/osim.py
+++ b/aitviewer/renderables/osim.py
@@ -172,7 +172,6 @@ def per_part_bone_colors(self):
         return vertex_colors
 
     def per_part_marker_colors(self):
-
         colors = vertex_colors_from_weights(np.arange(len(self.node_names)), alpha=1, shuffle=True)
 
         # Try to load a saved rigging file
@@ -266,7 +265,6 @@ def generate_meshes_dict(self):
         print(self.meshes_dict)
 
     def create_template(self):
-
         part_meshes = []
         for node_name in self.node_names:
             mesh = self.meshes_dict[node_name]
@@ -456,7 +454,6 @@ def fk(self):
                 #     continue
                 mesh = self.meshes_dict[node_name]
                 if mesh is not None:
-
                     part_verts = mesh.vertices
 
                     # pose part
diff --git a/aitviewer/utils/vtp_to_ply.py b/aitviewer/utils/vtp_to_ply.py
index 7cef528..cbf6819 100644
--- a/aitviewer/utils/vtp_to_ply.py
+++ b/aitviewer/utils/vtp_to_ply.py
@@ -6,7 +6,6 @@
 
 
 def convert_meshes(src_folder, dst_folder):
-
     src = src_folder
     if src[-1] != "/":
         src += "/"
@@ -21,7 +20,6 @@ def convert_meshes(src_folder, dst_folder):
 
     # for each file in src
     for filename in os.listdir(src):
-
         ext = os.path.splitext(filename)[-1]
         if ext not in [".vtp", ".obj"]:
             print("Skipping " + filename)
@@ -41,7 +39,6 @@ def convert_meshes(src_folder, dst_folder):
 
 
 if __name__ == "__main__":
-
     # Parse a vtp file and convert it to a ply file
     parser = argparse.ArgumentParser(description="Convert a folder of vtp files to a folder of ply files")
     parser.add_argument(
diff --git a/examples/load_SKEL.py b/examples/load_SKEL.py
index 97840ec..f5e4167 100644
--- a/examples/load_SKEL.py
+++ b/examples/load_SKEL.py
@@ -17,7 +17,6 @@
     raise e
 
 if __name__ == "__main__":
-
     parser = argparse.ArgumentParser(description="Load a SKEL model and display it.")
     parser.add_argument("-s", "--motion_file", type=str, help="Path to a skel motion file", default=None)
     parser.add_argument("-z", "--z_up", help="Rotate the mesh 90 deg", action="store_true")
@@ -53,7 +52,6 @@
         cam_pose = None
 
     else:
-
         assert os.path.exists(
             args.motion_file
         ), f"Could not find {args.motion_file}, please provide a valid path to a skel motion file."
diff --git a/examples/load_bioamass.py b/examples/load_bioamass.py
index 5cd9cf9..e06faf6 100644
--- a/examples/load_bioamass.py
+++ b/examples/load_bioamass.py
@@ -10,7 +10,6 @@
 from aitviewer.viewer import Viewer
 
 if __name__ == "__main__":
-
     subj_name = "01"
     seq_name = "03"
 
diff --git a/examples/load_markers.py b/examples/load_markers.py
index cbb427d..d62fec5 100644
--- a/examples/load_markers.py
+++ b/examples/load_markers.py
@@ -11,7 +11,6 @@
 from aitviewer.viewer import Viewer
 
 if __name__ == "__main__":
-
     # Display in the viewer.
     v = Viewer()
 
diff --git a/examples/load_osim.py b/examples/load_osim.py
index 6205073..dd07057 100644
--- a/examples/load_osim.py
+++ b/examples/load_osim.py
@@ -92,7 +92,6 @@ def display_model_in_viewer(
 
 
 if __name__ == "__main__":
-
     parser = argparse.ArgumentParser(
         description="Load an OpenSim model and a motion file and display it in the viewer."
     )