diff --git a/examples/curved_cadquery_object.py b/examples/curved_cadquery_object.py
index 9e6396d..107b2e7 100644
--- a/examples/curved_cadquery_object.py
+++ b/examples/curved_cadquery_object.py
@@ -2,6 +2,7 @@
 import cadquery as cq
 from math import sin, cos, pi, floor
 
+
 # define the generating function
 def hypocycloid(t, r1, r2):
     return (
diff --git a/src/cad_to_dagmc/core.py b/src/cad_to_dagmc/core.py
index 5e368d7..5c56751 100644
--- a/src/cad_to_dagmc/core.py
+++ b/src/cad_to_dagmc/core.py
@@ -95,8 +95,6 @@ def export_dagmc_h5m_file(
         center_atol: float = 0.000001,
         bounding_box_atol: float = 0.000001,
     ):
-
-
         brep_shape = self._merge_surfaces()
 
         tmp_brep_filename = mkstemp(suffix=".brep", prefix="paramak_")[1]
@@ -118,7 +116,7 @@ def export_dagmc_h5m_file(
         )
 
         material_tags_in_brep_order = []
-        for (brep_id, shape_id) in brep_and_shape_part_ids:
+        for brep_id, shape_id in brep_and_shape_part_ids:
             material_tags_in_brep_order.append(self.material_tags[shape_id - 1])
 
         brep_to_h5m(
diff --git a/tests/test_h5m_creation.py b/tests/test_h5m_creation.py
index d0e65f3..371b1b9 100644
--- a/tests/test_h5m_creation.py
+++ b/tests/test_h5m_creation.py
@@ -26,7 +26,6 @@ def test_h5m_with_single_volume_list():
     ]
 
     for stp_file, h5m_file in zip(stp_files, h5m_files):
-
         my_model = CadToDagmc()
         my_model.add_stp_file(filename=stp_file, material_tags=["mat1"])
         my_model.export_dagmc_h5m_file(filename=h5m_file)
@@ -35,7 +34,6 @@ def test_h5m_with_single_volume_list():
 
 
 def test_h5m_with_multi_volume_not_touching():
-
     stp_files = [
         "tests/two_disconnected_cubes.stp",
     ]
@@ -46,7 +44,6 @@ def test_h5m_with_multi_volume_not_touching():
         "tests/two_disconnected_cubes.h5m",
     ]
     for stp_file, mat_tags, h5m_file in zip(stp_files, material_tags, h5m_files):
-
         my_model = CadToDagmc()
         my_model.add_stp_file(filename=stp_file, material_tags=mat_tags)
 
@@ -61,7 +58,6 @@ def test_h5m_with_multi_volume_not_touching():
 
 
 def test_h5m_with_multi_volume_touching():
-
     stp_files = [
         "tests/multi_volume_cylinders.stp",
         "tests/two_connected_cubes.stp",
@@ -75,7 +71,6 @@ def test_h5m_with_multi_volume_touching():
         "tests/two_connected_cubes.h5m",
     ]
     for stp_file, mat_tags, h5m_file in zip(stp_files, material_tags, h5m_files):
-
         my_model = CadToDagmc()
         my_model.add_stp_file(stp_file, material_tags=mat_tags)
 
diff --git a/tests/test_h5m_in_simulation.py b/tests/test_h5m_in_simulation.py
index 86effed..0c676df 100644
--- a/tests/test_h5m_in_simulation.py
+++ b/tests/test_h5m_in_simulation.py
@@ -16,7 +16,6 @@ def transport_particles_on_h5m_geometry(
 
     materials = openmc.Materials()
     for material_tag in material_tags:
-
         # simplified material definitions have been used to keen this example minimal
         mat_dag_material_tag = openmc.Material(name=material_tag)
         mat_dag_material_tag.add_element("H", 1, "ao")
@@ -101,7 +100,6 @@ def test_h5m_with_single_volume_list():
     ]
 
     for h5m_file in h5m_files:
-
         transport_particles_on_h5m_geometry(
             h5m_filename=h5m_file,
             material_tags=["mat1"],
@@ -109,7 +107,6 @@ def test_h5m_with_single_volume_list():
 
 
 def test_h5m_with_multi_volume_not_touching():
-
     material_tags = [
         ["mat1", "mat2"],
     ]
@@ -117,14 +114,12 @@ def test_h5m_with_multi_volume_not_touching():
         "tests/two_disconnected_cubes.h5m",
     ]
     for mat_tags, h5m_file in zip(material_tags, h5m_files):
-
         transport_particles_on_h5m_geometry(
             h5m_filename=h5m_file, material_tags=mat_tags
         )
 
 
 def test_h5m_with_multi_volume_touching():
-
     material_tags = [
         ["mat1", "mat2", "mat3", "mat4", "mat5", "mat6"],
         ["mat1", "mat2"],
@@ -134,7 +129,6 @@ def test_h5m_with_multi_volume_touching():
         "tests/two_connected_cubes.h5m",
     ]
     for mat_tags, h5m_file in zip(material_tags, h5m_files):
-
         transport_particles_on_h5m_geometry(
             h5m_filename=h5m_file, material_tags=mat_tags
         )