#jython IRC Log

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IRC Log for 2014-06-28

Timestamps are in GMT/BST.

[7:28] -sendak.freenode.net- *** Looking up your hostname...
[7:28] -sendak.freenode.net- *** Checking Ident
[7:28] -sendak.freenode.net- *** No Ident response
[7:28] -sendak.freenode.net- *** Couldn't look up your hostname
[7:28] * JythonLogBot (~PircBot@74.50.59.201) has joined #jython
[7:28] * Topic is 'Try Jython 2.7b2 at http://tinyurl.com/myx9eum | This channel is logged: http://jython.extreme.st/irclogs/ | Please update the wiki: http://wiki.python.org/jython | Jython Book: http://jythonbook.com | Podcast: http://jython.org/jythonpodcast/'
[7:28] * Set by agronholm!~agronholm@2001:1bc8:102:6f29:bcdd:7fce:a201:cd5b on Wed May 07 05:55:05 UTC 2014
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[10:01] <sidrero> hello
[10:01] <sidrero> I am intrigued by something:
[10:02] <sidrero> in C-Python, if you are iterating trough a list, and the goal is to append values to a second list
[10:02] <sidrero> a list comprehension is faster than using append. Or also initializing the second list with the size you need is also more efficient than just append.
[10:03] <sidrero> in jython all methods look kind of similar in performance
[10:03] <sidrero> why is that?
[10:06] <sidrero> particularly I am very intrigued why creating the second list with the right size does not improve performance vs just using append
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[16:14] <jimbaker> sidrero, we do not do any specific optimizations for comprehensions/generator expressions, so that's probably why the speed difference. something to consider in the future
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