> > https://docs.python.org/3.8/library/collections.html has some > examples using collections.Counter, which is clearly described > as being a subclass of dict. Amongst the examples: > > c + d # add two counters together: c[x] + d[x] > > That's the + operator operating on two dicts (don't make me > quote the Liskov Substitution Principle), but doing something > really different than the base operator. > > So if I know that c and d (or worse, that one of them) is a > dict, then interpreting c + d becomes much more interesting,
Killing a use of a common operator with a very common built in data type because the operator is used in a different way by a specialized object in the stdlib seems a bit backwards to me. Frankly, I think considering Counter as a dict subclass is the mistake here, even if it is true. -CHB -- Christopher Barker, PhD Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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