I think you misunderstood me - otherwise I don't know what this email is
meant to accomplish. The conversation as I see it went:
Brandt in the PEP: X is an antipattern.
Andrew to Brandt: A strict flag would require us to do Y which you said is
an antipattern.
Me to Andrew: Y is fine, it's not an antipattern, the PEP said that X
(which is different from Y) is an antipattern, which I agree with.
You're confirming what I'm saying but it doesn't sound intentional,
especially at the start with "Then don't do it!".
On Sat, May 2, 2020 at 12:50 AM Steven D'Aprano <st...@pearwood.info> wrote:
> On Fri, May 01, 2020 at 11:30:17PM +0200, Alex Hall wrote:
>
> > Specifically the PEP says:
> >
> > > Another proposed idiom, per-module shadowing of the built-in zip with
> some
> > > subtly different variant from itertools, is an anti-pattern that
> shouldn't
> > > be encouraged.
> > >
> >
> > I think the PEP is saying it'd be an antipattern to shadow zip with a
> > version that is always strict. If you want both strict and non-strict in
> > the same file, you're in trouble.
>
> Then don't do it!
>
> If you want both, then it is trivially easy to use both:
>
>
> from itertools import zip_equal
> zip(zip_equal(a, b), c)
>
>
> > But replacing zip with a zip that has an
> > optional strict flag should be harmless.
>
> [Aside: I still disagree *strongly* with the use of a "strict" flag
> here.]
>
> Indeed, that's a perfectly safe and fine use of shadowing. Python is
> designed to allow shadowing. Calling it an "anti-pattern" is just wrong.
> Yes, shadowing can be abused, or done by accident, but intentional
> shadowing is a useful software design pattern. For instance:
>
> if not settings['print_diagnostics']:
> print = lambda *args, **kw: None
>
> def main():
> print('diagnostics go here')
> ...
>
>
> --
> Steven
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