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

Amaury Forgeot d'Arc amauryfa at gmail.com
Wed Feb 13 15:27:31 CET 2013

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
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-dev/attachments/20130213/8469ecd0/attachment.html>

More information about the Python-Dev mailing list