python-igraph

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Describe the bug

The formatting of warnings does not play well with the punctuation standard we use in the C core (i.e. that all warning messages should end in a fullstop or other relevant punctuation).

To reproduce

ig.Graph(n=5).hub_score()

RuntimeWarning: Hub and authority scores requested for undirected graph. These are the same as eigenvector centralities. at /centrality/hub_authority.c:297

Notice the fullstop before "at".

Easy solution: Capitalize the "at" as "At".

Version information

Current develop.