On Thu, Oct 11, 2018 at 12:34:13PM -0700, Chris Barker via Python-ideas wrote:
I don't care what is or isn't a subclass of what -- I don't think that's a Pythonic question. But I do think :
issubclass(frozendict, abc.Mapping) and issubclass(frozendict, abc.Hashable)
would be useful.
So you do care about what is and isn't a subclass :-) It is 2018 and we've had isinstance and issubclass in the language since Python 2.2 in 2002, I really wish that we could get away from the idea that checking types is unPythonic and duck-typing is the One True Way to do things. The old, Python 1.5 form of type-checking: type(spam) is dict was not so great, since it tested only for a specific type by identity. But with ABCs and virtual subclasses and inheritance, isinstance is a great way to check that your duck both quacks and swims, rather than watching it sink and drown in the middle of your function :-) -- Steve