Message 61747 - Python tracker

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In-reply-to
Author	pitrou
Recipients	lemburg, orivej, pitrou
Date	2008年01月27日.19:03:09
SpamBayes Score	0.02377089
Marked as misclassified	No
Message-id	<1201460590.16.0.369302690305.issue1943@psf.upfronthosting.co.za>

Content
I know it's not the place to discuss #1629305, but the join() solution is not always faster. Why? Because 1) there's the list contruction and method call overhead 2) ceval.c has some bytecode hackery to try and make plain concatenations somewhat less slow. As for cStringIO, I actually observed in some experiments that it was slower than the other alternatives, at least for short strings. All in all, choosing between the three idioms is far from obvious and needs case-by-case analysis.

Content

I know it's not the place to discuss #1629305, but the join() solution
is not always faster. Why? Because 1) there's the list contruction and
method call overhead 2) ceval.c has some bytecode hackery to try and
make plain concatenations somewhat less slow.
As for cStringIO, I actually observed in some experiments that it was
slower than the other alternatives, at least for short strings. All in
all, choosing between the three idioms is far from obvious and needs
case-by-case analysis.

History
Date	User	Action	Args
2008年01月27日 19:03:10	pitrou	set	spambayes_score: 0.0237709 -> 0.02377089 recipients: + pitrou, lemburg, orivej
2008年01月27日 19:03:10	pitrou	set	spambayes_score: 0.0237709 -> 0.0237709 messageid: <1201460590.16.0.369302690305.issue1943@psf.upfronthosting.co.za>
2008年01月27日 19:03:09	pitrou	link	issue1943 messages
2008年01月27日 19:03:09	pitrou	create

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