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

[Amaury Forgeot d'Arc]

2013/2/13 Lennart Regebro <regebro at gmail.com>

> On Wed, Feb 13, 2013 at 1:10 PM, Serhiy Storchaka <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.

-- 
Amaury Forgeot d'Arc
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