[Python-Dev] Usage of += on strings in loops in stdlib

[Christian Tismer]

On 13.02.13 15:27, Amaury Forgeot d'Arc wrote:
>
> 2013/2/13 Lennart Regebro <regebro at gmail.com <mailto:regebro at gmail.com>>
>
>     On Wed, Feb 13, 2013 at 1:10 PM, Serhiy Storchaka
>     <storchaka at gmail.com <mailto:storchaka at gmail.com>> wrote:
>     > I prefer "x = '%s%s%s%s' % (a, b, c, d)" when string's number is
>     more than 3
>     > and some of them are literal strings.
>
>     This has the benefit of being slow both on CPython and PyPy. Although
>     using .format() is even slower. :-)
>
>
> Did you really try it?
> PyPy is really fast with str.__mod__, when the format string is a 
> constant.
> Yes, it's jitted.

How about the .format() style: Is that jitted as well?
In order to get people to prefer .format over __mod__,
it would be nice if PyPy made this actually _faster_ :-)

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