[pywikibot] Re: Path between a category and an article

I once went down a similar rathole. I was trying to find all article which were (recursively) in Category:Music. That's when I discovered just what a mess the wiki category graph is. At first glance, it looks like a tree, but it's not. It's not even a DAG. It has cycles! And not just "it can theoretically have cycles", but "in real life, cycles do exist". In fact, if you start to walk the graph from Music, you will indeed end up hitting a cycle. But, OK, we know how to detect and break cycles. But even if you do that, it turns out there are occasional links that go off into weird directions and pretty soon I was finding pages that had absolutely nothing to do with music. But enough of that. If this was a one-off job, what I'd do is take the source for Category.articles(), add just before "yield member" I'd add: if member.title() == "p": raise a RuntimeException, and then look at the stack dump to see how you got there. If you had to do this programmatically, I'd do something similar, but modify the code to explicitly maintain a stack of subcategories. Or if you want to be cute, just use inspect.Traceback and take advantage of the stack that the python interpreter is already maintaining for you.