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Date: Sun, 1 Jun 2014 19:59:36 +1000
Subject: Re: IDE for python
From: Chris Angelico <rosuav@gmail.com>
Cc: "python-list@python.org" <python-list@python.org>
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Xref: csiph.com comp.lang.python:72369

On Sun, Jun 1, 2014 at 7:06 PM, Steven D'Aprano
<steve+comp.lang.python@pearwood.info> wrote:
> On Sun, 01 Jun 2014 18:31:09 +1000, Chris Angelico wrote:
>
>> the better solution is to permit the full Unicode alphabet in
>> identifiers...
>
> I'm not entirely sure about that. Full Unicode support in identifiers
> such as URLs doesn't create a brand new vulnerability, but it does
> increase it from a fairly minor problem to something *much* harder to
> deal with. It's bad enough when somebody manages to fool you into going
> to (say) app1e.com instead of apple.com, without also being at risk from
> =D0=B0=D1=80=D1=80l=D0=B5, =D0=B0p=D1=80l=D0=B5, =D0=B0=D1=80pl=D0=B5 and=
 =D0=B0=D1=80=D1=80le (to mention just a few). At least nobody
> can fake .com with .=D1=81=D0=BEm.
>
> To put it another way:
>
> py> =D0=B0=D1=80=D1=80l=D0=B5 =3D 23
> py> apple =3D 42
> py> assert =D0=B0=D1=80=D1=80l=D0=B5 =3D=3D apple
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
> AssertionError

Yeah, that is a concern. But as you say, it's already possible to
confuse rn with m (in many fonts) and i/l/1, and (on a different
level) Foo, foo, _foo, _Foo, and FOO, or movement_Direction and
movement_direction. If you saw one of those in one part of a program
and another in another, you'd have to consume an annoying amount of
mindspace to keep them separate.

Note, incidentally, that I said "alphabet" rather than the entire
Unicode character set. I do *not* support the use of, for instance,
U+200B 'ZERO WIDTH SPACE' in identifiers, that's just stupid :)

ChrisA