diff --git a/docker-network-graph.py b/docker-network-graph.py
index bd00804..b23ba80 100755
--- a/docker-network-graph.py
+++ b/docker-network-graph.py
@@ -10,8 +10,19 @@ from graphviz import Graph
 from graphviz.backend import FORMATS
 
 # colorlover.scales["12"]["qual"]["Paired"] converted to hex strings
-COLORS = ["#1f78b4", "#33a02c", "#e31a1c", "#ff7f00", "#6a3d9a", "#b15928", "#a6cee3", "#b2df8a", "#fdbf6f",
-          "#cab2d6", "#ffff99"]
+COLORS = [
+    "#1f78b4",
+    "#33a02c",
+    "#e31a1c",
+    "#ff7f00",
+    "#6a3d9a",
+    "#b15928",
+    "#a6cee3",
+    "#b2df8a",
+    "#fdbf6f",
+    "#cab2d6",
+    "#ffff99",
+]
 i = 0
 
 
@@ -58,7 +69,9 @@ def get_unique_color() -> str:
     return c
 
 
-def get_networks(client: docker.DockerClient, verbose: bool) -> typing.Dict[str, Network]:
+def get_networks(
+    client: docker.DockerClient, verbose: bool
+) -> typing.Dict[str, Network]:
     networks: typing.Dict[str, Network] = {}
 
     for net in sorted(client.networks.list(), key=lambda k: k.name):
@@ -83,7 +96,9 @@ def get_networks(client: docker.DockerClient, verbose: bool) -> typing.Dict[str,
             pass
 
         if verbose:
-            print(f"Network: {net.name} {'internal' if internal else ''} {'isolated' if isolated else ''} gw:{gateway}")
+            print(
+                f"Network: {net.name} {'internal' if internal else ''} {'isolated' if isolated else ''} gw:{gateway}"
+            )
 
         color = get_unique_color()
         networks[net.name] = Network(net.name, gateway, internal, isolated, color)
@@ -93,7 +108,9 @@ def get_networks(client: docker.DockerClient, verbose: bool) -> typing.Dict[str,
     return networks
 
 
-def get_containers(client: docker.DockerClient, verbose: bool) -> (typing.List[Container], typing.List[Link]):
+def get_containers(
+    client: docker.DockerClient, verbose: bool
+) -> (typing.List[Container], typing.List[Link]):
     containers: typing.List[Container] = []
     links: typing.List[Link] = []
 
@@ -101,7 +118,9 @@ def get_containers(client: docker.DockerClient, verbose: bool) -> (typing.List[C
         interfaces: typing.List[Interface] = []
 
         # Iterate over container interfaces
-        for net_name, net_info in container.attrs["NetworkSettings"]["Networks"].items():
+        for net_name, net_info in container.attrs["NetworkSettings"][
+            "Networks"
+        ].items():
             endpoint_id = net_info["EndpointID"]
 
             aliases = []
@@ -111,11 +130,13 @@ def get_containers(client: docker.DockerClient, verbose: bool) -> (typing.List[C
                     if alias != container.id[:12] and alias != container.name:
                         aliases.append(alias)
 
-            interfaces.append(Interface(endpoint_id, net_info['IPAddress'], aliases))
+            interfaces.append(Interface(endpoint_id, net_info["IPAddress"], aliases))
             links.append(Link(container.id, endpoint_id, net_name))
 
         if verbose:
-            print(f"Container: {container.name} {''.join([iface.address for iface in interfaces])}")
+            print(
+                f"Container: {container.name} {''.join([iface.address for iface in interfaces])}"
+            )
 
         containers.append(Container(container.id, container.name, interfaces))
 
@@ -130,12 +151,13 @@ def draw_network(g: Graph, net: Network):
         label += " | Containers isolated"
     label += "}"
 
-    g.node(f"network_{net.name}",
-           shape="record",
-           label=label,
-           fillcolor=net.color,
-           style="filled"
-           )
+    g.node(
+        f"network_{net.name}",
+        shape="record",
+        label=label,
+        fillcolor=net.color,
+        style="filled",
+    )
 
 
 def draw_container(g: Graph, c: Container):
@@ -152,19 +174,21 @@ def draw_container(g: Graph, c: Container):
 
     label = f"{{ {c.name} | {{ {' | '.join(iface_labels)} }} }}"
 
-    g.node(f"container_{c.container_id}",
-           shape="record",
-           label=label,
-           fillcolor="#ff9999",
-           style="filled"
-           )
+    g.node(
+        f"container_{c.container_id}",
+        shape="record",
+        label=label,
+        fillcolor="#ff9999",
+        style="filled",
+    )
 
 
 def draw_link(g: Graph, networks: typing.Dict[str, Network], link: Link):
-    g.edge(f"container_{link.container_id}:{link.endpoint_id}",
-           f"network_{link.network_name}",
-           color=networks[link.network_name].color
-           )
+    g.edge(
+        f"container_{link.container_id}:{link.endpoint_id}",
+        f"network_{link.network_name}",
+        color=networks[link.network_name].color,
+    )
 
 
 def generate_graph(verbose: bool, file: str):
@@ -175,9 +199,18 @@ def generate_graph(verbose: bool, file: str):
 
     if file:
         base, ext = os.path.splitext(file)
-        g = Graph(comment="Docker Network Graph", engine="sfdp", format=ext[1:], graph_attr=dict(splines="true"))
+        g = Graph(
+            comment="Docker Network Graph",
+            engine="sfdp",
+            format=ext[1:],
+            graph_attr=dict(splines="true"),
+        )
     else:
-        g = Graph(comment="Docker Network Graph", engine="sfdp", graph_attr=dict(splines="true"))
+        g = Graph(
+            comment="Docker Network Graph",
+            engine="sfdp",
+            graph_attr=dict(splines="true"),
+        )
 
     for _, network in networks.items():
         draw_network(g, network)
@@ -205,7 +238,9 @@ def graphviz_output_file(filename: str):
 if __name__ == "__main__":
     parser = argparse.ArgumentParser(description="Visualize docker networks.")
     parser.add_argument("-v", "--verbose", help="Verbose output", action="store_true")
-    parser.add_argument("-o", "--out", help="Write output to file", type=graphviz_output_file)
+    parser.add_argument(
+        "-o", "--out", help="Write output to file", type=graphviz_output_file
+    )
     args = parser.parse_args()
 
     generate_graph(args.verbose, args.out)