What about Decimal snan? On Sat, Dec 28, 2019, 5:53 PM Christopher Barker <python...@gmail.com> wrote:
> On Sat, Dec 28, 2019 at 2:41 AM Antoine Pitrou <solip...@pitrou.net> > wrote: > >> +1 for a .is_nan() method on suitable types. That's the most natural >> and elegant solution, IMHO. Tricks like "x == x" are nice when you >> *know* that x is a float or Decimal, but not in the general case. >> > > agreed -- while it may work in almost all cases, what it is really > checking is whether an object compares to itself, which is not question > being asked. > > I suppose we could do something like: > > def is_nan(num): > try: > return num.is_nan() > except AttributeError: > if isinstance(num, Number): > return not (num == num) > else: > return False > > Running it on my test code, it works for everything I thought to test > except numpy arrays of size 1. > > -CHB > > > -- > Christopher Barker, PhD > > Python Language Consulting > - Teaching > - Scientific Software Development > - Desktop GUI and Web Development > - wxPython, numpy, scipy, Cython > -- > Christopher Barker, PhD > > Python Language Consulting > - Teaching > - Scientific Software Development > - Desktop GUI and Web Development > - wxPython, numpy, scipy, Cython > _______________________________________________ > 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/WYRLHSVZTPE756XXGHDXW2HK624DPW5P/ > Code of Conduct: http://python.org/psf/codeofconduct/ >
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