On Wed, Oct 7, 2020, 3:43 AM Serhiy Storchaka <storch...@gmail.com> wrote:
> 07.10.20 06:04, Guido van Rossum пише: > > Ironically, complex numbers have a `__float__` > > method that always fails, and floats don't have a `__complex__` method > > but complex(x) succeeds if x is a float... > > I wonder why not remove complex.__float__ (and complex.__int__, > complex.__floordiv__, etc)? > I wonder the same thing myself and I bet it gets complicated fast. I was trying to use the numbers module to type hint any number including both floats and decimal.Decimal the other evening. It doesn't work... type checkers don't know Decimal is a Number. Finally I discovered the correct current solution is just Union[Decimal, float] or Union[Decimal, float, Real] if you want to include other real numbers like fractions.Fraction. St first I was really annoyed but from what I was able to gather after some reading Monday evening, this is a known problem that is getting worked on and is because the abcs in the current numbers module are somewhat unusable for type hinting and need to be replaced/updated to make Number and friends into protocols. And I came away grateful there are smart people people working on this to make things better, rather than annoyed. I'll be interested to see what is come up with as a solution in 3.10.
_______________________________________________ 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/QUFFYVQSEFTUSDSQ2XAGJFLSHOB4C4AG/ Code of Conduct: http://python.org/psf/codeofconduct/
