Aaron Iles added the comment:
My +1 is for the callback based approach. The brevity of the search loop for
finding the innermost function is (in my opinion at least) non-obvious, relying
on for loops not having their own scope as it does.
If a generator based API was adopted instead, I propose a convenience function
(unwrap_all?) to help developers avoid writing code like:
inner = None
for inner in functools.unwrap(outer):
pass
if inner is None:
inner = outer
Which combines a misunderstanding of the API with for loop scope shortcut.
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<http://bugs.python.org/issue13266>
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