[issue34635] inspect: add tools for inspecting subclasses

[Benjamin Mintz]

Benjamin Mintz <benjabean1 at gmail.com> added the comment:

I didn't have one in mind. I just noticed that there was a getmro which accessed __mro__ but no corresponding method for __subclasses__.
That got me getsubclasses and getallsubclasses.

Then I thought it would be cool if you could walk the tree of subclasses in code, so I wrote getsubclasstree.

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<https://bugs.python.org/issue34635>
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