title: calculate indegree centralization of graph with python networkx
body: <p>I have a graph and want to calculate its indegree and outdegree centralization. I tried to do this by using <code>python networkx</code>, but there I can only find a method to calculate indegree and outdegree centrality for each node. Is there a way to calculate in- and outdegree centralization of a graph in <code>networkx</code>?</p>