Vedran Čačić added the comment:

Operator seems OK. After all, we can currently do c+c, which is kinda like c*2 
(sequences behave this way generally, and it is a usual convention in 
mathematics too). And division by a number is just a multiplication by its 
reciprocal. But a dedicated normalize method? No. As Josh said, then you're 
forking the API.

The correct way is probably to have a "normalized view" of a Counter. But I 
don't know the best way to calculate it fast. I mean, I know it mathematically 
(cache the sum of values and update it on every Counter update) but I don't 
know whether it's Pythonic enough.

nosy: +veky

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