Le 03/10/2011 04:19, Victor Stinner a écrit :
I restored this hack in Python 3.3 using PyUnicode_Append() in ceval.c and by
optimizing PyUnicode_Append() (try to append in-place). str+=str is closer
again to ''.join:
str += str: 696 ms
''.join(): 547 ms
I disabled temporary the optimization for wstr string in PyUnicode_Resize()
because of a bug. I disabled completly resize on Windows because of another
bug.
Ok, bugs fixed, all "resize" optimizations are now enabled:
Python 3.3
str += str : 119 ms
''.join() : 130 ms
StringIO.join : 147 ms
StringBuilder : 404 ms
array('u') : 979 ms
Hum, str+=str is now the fastest method, even faster than ''.join() !?
It's maybe time to optimize str.join ;-)
Victor
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