fix get random color

README.md

@@ -3,7 +3,7 @@
 Visualize the relationship between Docker networks and containers
 as a neat graphviz graph.
 
-This repository fork [e-dant/docker-network-graph](https://github.com/e-dant/docker-network-graph)
+This repository fork [MuratovAS/docker-network-graph](https://github.com/MuratovAS/docker-network-graph)
 Changes:
 - Improved design
 - Added the ability to generate url
@@ -30,7 +30,18 @@ If you want to generate a graph for a remote system you can also easily
 run this script inside a pre-built docker container:
 
 ```bash
-docker run --rm -v /var/run/docker.sock:/var/run/docker.sock ghcr.io/muratovas/docker-network-graph:latest -u
+build container
+
+    docker build . -t simono41/docker-network-graph
+
+and create a PNG
+
+    docker run --rm -v /var/run/docker.sock:/var/run/docker.sock simono41/docker-network-graph | dot -Tpng -o out.png
+
+or as SVG
+
+    docker run --rm -v /var/run/docker.sock:/var/run/docker.sock simono41/docker-network-graph | dot -Tsvg -o out.svg
+
 ```
 
 For more advanced use cases you can append arguments to the `docker run`
@@ -40,7 +51,7 @@ command as if you were running it in a local shell.
 In most cases what you want to run are the following couple commands:
 
 ```bash
-git clone https://github.com/muratovas/docker-network-graph.git
+git clone https://github.com/simono41/docker-network-graph.git
 cd docker-network-graph
 pipenv install
 pipenv run python docker-network-graph.py -o output.svg

docker-network-graph.py

@@ -77,11 +77,10 @@ def get_unique_color() -> str:
         i += 1
     else:
         # Generate random color if we've already used the 12 preset ones
-        c = '#'.join([f"{random.randint(0, 255):02x}" for _ in range(3)])
+        c = "#{:06x}".format(random.randint(0, 0xFFFFFF))
 
     return c
 
-
 def get_networks(
     client: docker.DockerClient, verbose: bool
 ) -> typing.Dict[str, Network]:
@@ -90,7 +89,7 @@ def get_networks(
     for net in sorted(client.networks.list(), key=lambda k: k.name):
         try:
             gateway = net.attrs["IPAM"]["Config"][0]["Subnet"]
-        except (KeyError, IndexError):
+        except (KeyError, IndexError, TypeError):
             # This network doesn't seem to be used, skip it
             continue
 
@@ -234,13 +233,13 @@ def generate_graph(verbose: bool, file: str, url: str):
             comment="Docker Network Graph",
             engine="sfdp",
             format=ext[1:],
-            graph_attr=dict(splines="true"),
+            graph_attr={'splines': 'true', 'rankdir': 'LR'},
         )
     else:
         g = Graph(
             comment="Docker Network Graph",
             engine="sfdp",
-            graph_attr=dict(splines="true"),
+            graph_attr={'splines': 'true', 'rankdir': 'LR'},
         )
 
     for _, network in networks.items():