On 24 August 2017 at 10:41, xoviat <xov...@gmail.com> wrote: > On Aug 24, 2017 8:28 AM, "Thomas Kluyver" <tho...@kluyver.me.uk> wrote: > >> On Thu, Aug 24, 2017, at 02:21 PM, xoviat wrote: >> >> I mean is this golang or Python? In Python, you raise notimplementederror. >> >> >> But there's a NotImplemented singleton in Python as well. The argument >> for using a return value is that the hook code has to deliberately return >> that, whereas a NotImplementedError could bubble up from some internal >> call, in which case it should really be registered as an error. >> > > > That's actually the general argument against exceptions and why golang > doesn't have them. I have not seen notimplemented used in the wild ever > though. >
https://github.com/python/cpython/blob/6f0eb93183519024cb360162bdd81b9faec97ba6/Lib/fractions.py#L382 So, yes, it's used in the wild, by stdlib itself no less.
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