[issue30196] Add __matmul__ to collections.Counter

Changes by Raymond Hettinger : -- resolution: -> rejected stage: test needed -> resolved status: open -> closed ___ Python tracker

[issue30196] Add __matmul__ to collections.Counter

Terry J. Reedy added the comment: The '|' should be '&' to avoid useless summing of 0 products. I think this should be rejected. Python's number and collections classes provide basic operations from which users can build application-specific functions. Or in the case of floats, we provide a

[issue30196] Add __matmul__ to collections.Counter

Changes by Ivan Levkivskyi : -- nosy: +levkivskyi ___ Python tracker ___ ___

[issue30196] Add __matmul__ to collections.Counter

Raymond Hettinger added the comment: Periodically, I've looked at possibly adding these kind of extensions. The argument in favor in that it is easy to do and is an obvious extension with plausible utility. The main arguments against is that it represents feature creep far removed from

[issue30196] Add __matmul__ to collections.Counter

Changes by Jim Fasarakis-Hilliard : -- versions: -Python 3.3, Python 3.4, Python 3.5, Python 3.6 ___ Python tracker ___

[issue30196] Add __matmul__ to collections.Counter

Changes by Jim Fasarakis-Hilliard : -- nosy: +Jim Fasarakis-Hilliard ___ Python tracker ___

[issue30196] Add __matmul__ to collections.Counter

Changes by Serhiy Storchaka : -- assignee: -> rhettinger nosy: +rhettinger ___ Python tracker ___

[issue30196] Add __matmul__ to collections.Counter

New submission from Jáchym Barvínek: The class collections.Counter should semantically contain only numbers, so it makes sense to define dot product od Counters, something like this: def __matmul__(self, other): return sum(self[x] * other[x] for x in self.keys() | other.keys()) I find this