Dennis Sweeney <[email protected]> added the comment:
The values of a Counter are generally integers, not lists. Maybe you want:
items_by_keyfunc = defaultdict(list)
for x in all_the_items:
items_by_keyfunc[keyfunc(x)].append(x)
Then items_by_keyfunc[42] is a list of the things with key 42.
Although I believe there have been proposals about adding some method to dict()
to do basically the for-loop above.
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<https://bugs.python.org/issue45338>
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