diff --git a/examples/circos/edge_color.py b/examples/circos/edge_color.py
index aad02648..6abb2db2 100644
--- a/examples/circos/edge_color.py
+++ b/examples/circos/edge_color.py
@@ -1,6 +1,7 @@
 """
 Shows different edge colors. Either categorial/ordinal or continuous
 """
+
 import matplotlib.pyplot as plt
 import networkx as nx
 from nxviz.plots import CircosPlot
diff --git a/examples/circos/edge_width.py b/examples/circos/edge_width.py
index 64b7228a..ed265509 100644
--- a/examples/circos/edge_width.py
+++ b/examples/circos/edge_width.py
@@ -1,6 +1,7 @@
 """
 Shows different edge widths on CircusPlot
 """
+
 import matplotlib.pyplot as plt
 import networkx as nx
 from nxviz.plots import CircosPlot
diff --git a/nxviz/__init__.py b/nxviz/__init__.py
index 979f8f92..69b1f632 100644
--- a/nxviz/__init__.py
+++ b/nxviz/__init__.py
@@ -1,4 +1,5 @@
 """Top-level nxviz API."""
+
 from .api import (
     arc,
     hive,
diff --git a/nxviz/annotate.py b/nxviz/annotate.py
index 9373460f..57c149c3 100644
--- a/nxviz/annotate.py
+++ b/nxviz/annotate.py
@@ -1,4 +1,5 @@
 """Annotation submodule."""
+
 from functools import partial, update_wrapper
 from typing import Dict, Hashable
 
diff --git a/nxviz/api.py b/nxviz/api.py
index 08486044..acaa4c59 100644
--- a/nxviz/api.py
+++ b/nxviz/api.py
@@ -1,6 +1,5 @@
 """High level nxviz plotting API."""
 
-
 from functools import partial, update_wrapper
 from typing import Callable, Dict, Hashable
 
diff --git a/nxviz/encodings.py b/nxviz/encodings.py
index b73987d5..9386c08e 100644
--- a/nxviz/encodings.py
+++ b/nxviz/encodings.py
@@ -1,4 +1,5 @@
 """Functions to encode data inside visual properties of nodes and edges."""
+
 from functools import partial
 from typing import Callable, Tuple
 
diff --git a/nxviz/facet.py b/nxviz/facet.py
index 7f835ae8..387f3263 100644
--- a/nxviz/facet.py
+++ b/nxviz/facet.py
@@ -6,6 +6,7 @@
 The others are faceting functions that can be called on.
 The faceting functions rely on the high level API for plotting.
 """
+
 import warnings
 from functools import partial, update_wrapper
 from itertools import combinations
diff --git a/nxviz/geometry.py b/nxviz/geometry.py
index e1960de8..d6f79d66 100644
--- a/nxviz/geometry.py
+++ b/nxviz/geometry.py
@@ -1,6 +1,7 @@
 """
 Utility geometry functions that can help with drawing to screen.
 """
+
 import numpy as np
 
 from .polcart import to_cartesian
diff --git a/nxviz/io.py b/nxviz/io.py
index 1d6b2cba..2e1c9dcf 100644
--- a/nxviz/io.py
+++ b/nxviz/io.py
@@ -1,4 +1,5 @@
 """Deprecated module no longer used."""
+
 import pandas as pd
 from networkx import Graph, MultiGraph
 
diff --git a/nxviz/lines.py b/nxviz/lines.py
index d7fba70e..a601b43a 100644
--- a/nxviz/lines.py
+++ b/nxviz/lines.py
@@ -1,6 +1,5 @@
 """Patch generators for edges."""
 
-
 from itertools import product
 from typing import Dict, Iterable, List
 
diff --git a/nxviz/utils.py b/nxviz/utils.py
index 1e31564d..47660837 100644
--- a/nxviz/utils.py
+++ b/nxviz/utils.py
@@ -1,4 +1,5 @@
 """Utility functions."""
+
 from collections import Counter
 
 import pandas as pd
diff --git a/tests/conftest.py b/tests/conftest.py
index 7f14ea05..9cc9ec9b 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -1,2 +1,3 @@
 """Pytest configuration."""
+
 from .fixtures.graphs import dummyG, geoG, manygroupG, smallG
diff --git a/tests/test_midlevel_api.py b/tests/test_midlevel_api.py
index e6492c83..f5f96998 100644
--- a/tests/test_midlevel_api.py
+++ b/tests/test_midlevel_api.py
@@ -1,6 +1,5 @@
 """Integration tests that operate at the mid-level API."""
 
-
 from nxviz import nodes, edges
 import pytest
 
diff --git a/tests/test_polcart.py b/tests/test_polcart.py
index 4f05a6a6..f7a7d81c 100644
--- a/tests/test_polcart.py
+++ b/tests/test_polcart.py
@@ -1,4 +1,5 @@
 """Tests for polcart submodule."""
+
 import numpy as np
 
 from hypothesis import assume, given, settings