[Python-ideas] π = math.pi

[Guido van Rossum]

AFAK it was in whatever PEP introduced Unicode identifiers.

On Jun 3, 2017 11:24 PM, "Nick Coghlan" <ncoghlan at gmail.com> wrote:

> On 4 June 2017 at 05:02, Dan Sommers <dan at tombstonezero.net> wrote:
> > On Sat, 03 Jun 2017 17:45:43 +0000, Brett Cannon wrote:
> >
> >> On Fri, 2 Jun 2017 at 15:56 Guido van Rossum <guido at python.org> wrote:
> >>
> >>> I would love to show how easy it is to write
> >>>
> >>> from math import pi as π, gamma as Γ
> >
> > [...]
> >
> >>> but I had to cheat by copying from the OP since I don't know how to
> type
> >>> these (and even if you were to tell me how I'd forget tomorrow). So, I
> am
> >>> still in favor of the rule "only ASCII in the stdlib".
> >>
> >> Since this regularly comes up, why don't we add a note to the math
> module
> >> that you can do the above import(s) to bind various mathematical
> constants
> >> to their traditional symbol counterparts? ...
> >
> > Because in order to add that note to the math module, you have to
> > violate the "only ASCII in the stdlib" rule.  ;-)
>
> The ASCII-only restriction in the standard library is merely "all
> public APIs will use ASCII-only identifiers", rather than "We don't
> allow the use of Unicode anywhere" (Several parts of the documentation
> would be rather unreadable if they were restricted to ASCII
> characters).
>
> However, clarifying that made me realise we've never actually written
> that down anywhere - it's just been an assumed holdover from the fact
> that Python 2.7 is still being supported, and doesn't allow for
> Unicode identifiers in the first place.
>
> https://github.com/python/peps/pull/285 is a PR to explicitly document
> the standard library API restriction in the "Names to Avoid" part of
> PEP 8.
>
> Cheers,
> Nick.
>
> --
> Nick Coghlan   |   ncoghlan at gmail.com   |   Brisbane, Australia
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