I started the following small project:

https://github.com/AndreaCrotti/import-tree

because I would like to find out what exactly depends on what at run-time, using an import hook.

It works quite well for small examples but the main problem is that once a module is imported it's added to sys.modules and then it doesn't go through the import hook anymore.

I tried to mess around with sys.modules but it might not be a good idea, and it leads to easy
infinite loops.
Is there a good way to achieve this?
I guess I could do the loop detection myself, but that should not be too hard..

Thanks,
Andrea
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