On Wed, Feb 13, 2013 at 4:02 PM, Amaury Forgeot d'Arc email@example.com wrote:
2013/2/13 Lennart Regebro firstname.lastname@example.org
On Wed, Feb 13, 2013 at 3:27 PM, Amaury Forgeot d'Arc email@example.com wrote:
Yes, it's jitted.
Admittedly, I have no idea in which cases the JIT kicks in, and what I should do to make that happen to make sure I have the best possible real-life test cases.
PyPy JIT kicks in only after 1000 iterations.
Actually, my test code mixed iterations and string length up when printing the results, so the tests I showed was not 100 iterations with 10.000 long string, but 10.000 iterations with 100 long strings.
No matter what the iteration/string length is .format() is the slowest or second slowest of all string concatenation methods I've tried and '%s%s' % just marginally faster. This both on PyPy and CPython and irrespective of string length.
I'll stick my neck out and say that using formatting for concatenation is probably an anti-pattern.