[Python-Dev] Usage of += on strings in loops in stdlib (original) (raw)

Christian Tismer tismer at stackless.com
Wed Feb 13 15:34:06 CET 2013

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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