> But wait a minute, zip isn't just a "callable", it's a class, and adding more methods to it seems perfectly natural, just like lots of other built-in classes.
> > Zip is a class in CPython 3.8. it may or may not be in other > implementations or versions. The API users are currently promised says > nothing about it needing to be implemented as a class. > and it was a function in 2.7. But though Python blurs the lines between various callables and functions, there is a general "sense" of how they are used. And for the most part, zip is not used like a class. WE "use" classes, usually, by creating instances, and then calling various methods on them, etc. a zip instance on the other hand, returns an iterable, that does not provide any other methods or uses. I have to say, I have not idea why zip is a class rather than a function that returns a zip_iterator instance, but it is certainly an implementation detail. So while yes, alternate constructors are a common pattern, I don't think they are a common pattern for classes like zip. That being said, I still like it. -CHB > Moreover, even if Python 3.9 decides to make zip() a function instead, > that wouldn't prevent the alternate constructors being implemented. > _______________________________________________ > Python-ideas mailing list -- python-ideas@python.org > To unsubscribe send an email to python-ideas-le...@python.org > https://mail.python.org/mailman3/lists/python-ideas.python.org/ > Message archived at > https://mail.python.org/archives/list/python-ideas@python.org/message/RWE6ZETU3Y6CU43FPAH2MC2KKQCKPH2P/ > Code of Conduct: http://python.org/psf/codeofconduct/ > -- Christopher Barker, PhD Python Language Consulting - Teaching - Scientific Software Development - Desktop GUI and Web Development - wxPython, numpy, scipy, Cython
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