[Python-Dev] PEP 460: allowing %d and %f and mojibake

Nick Coghlan ncoghlan at gmail.com
Tue Jan 14 23:07:15 CET 2014


On 15 Jan 2014 08:00, "Greg Ewing" <greg.ewing at canterbury.ac.nz> wrote:
>
> Guido van Rossum wrote:
>>
>> def spam(a):
>>     r = asciistr('(')
>>     if a: r += a.strip()
>>     r += asciistr(')')
>>     return r
>>
>>  The general fix would be to add
>>
>>     else: r += a[:0]
>
>
> The awkwardness might be reducable if asciistr let
> you write something like
>
>    r = asciistr('(', a)
>
> meaning "give me either a string or bytes containing
> the value '(', depending on the type of a".
>
> But taking a step back, how bad would it really be
> if an asciistr were returned in this case? Is it
> just that asciistr doesn't behave exactly like a str
> in all situations, so it might break something?
>
> If so, would it help if asciistr were a built-in
> type, so that other things could be made aware of
> it?

That way lies the Python 2 text model, and we're not going there. It's
probably best to think of asciistr as a way of demonstrating a rhetorical
point about the superiority of the Python 3 text model rather than
something that anyone should actually use in production Python 3 code
(although, depending on how rough the edges turn out to be, it *might*
eventually find a place in some single source 2/3 code bases, as well as in
prototype code and personal scripts).

Cheers,
Nick.

>
> --
> Greg
>
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