On 23/12/2013 06:07, Keith Winston wrote:
On Sun, Dec 22, 2013 at 3:04 PM, <[email protected]
<mailto:[email protected]>> wrote:
games = [p1.gameset(gamecount) for _ in range(multicount)]
So Peter gave me a list of suggesttions, all of which I've incorporated
and gotten running, and it's been instructive.
But in my haste I included the line above, cut & pasted from his
suggestion, without understanding what the underscore is doing in there.
I think I understand that at the prompt of the interpreter the
underscore returns the last value returned... but I can't really figure
out what it's doing here.
Also: this statement worked fine:
for tmulti in games:
print("{moves:9.2f} {chutes:12.2f} {ladders:13.2f}".format(
moves=mean(tgset[1] for tgset in tmulti),
chutes=mean(tgset[2] for tgset in tmulti),
ladders=mean(tgset[3] for tgset in tmulti)
))
Which is sort of awesome to me, but in my efforts to riff on it I've
been stumped: if I want to further process the arrays/lists my list
comprehensions are generating, I sort of can't, since they're gone: that
is, if I wanted to use the entire len(tmulti) of them to determine grand
total averages and variances, I can't. And if my array is large, I
woudn't want to iterate over it over and over to do each of these steps,
I think. Anyway, I'm just goofing on all this, for the learning value,
but I'll appreciate any thoughts. Thanks.
I'm also trying to speed up the program at this point: the way I've set
it up now it builds a list of lists (of lists) of all the stats of all
the games of all the gamesets of all the multisets. I've visually
streamlined it some, without any effect on performance I can detect.
Would using arrays, or tuples, or something else be likely to be faster?
It's interesting that running it on my 8 y.o. Core 2 Duo and my 2 y.o.
Core I5 result in virtually exactly the same speed. Weird. Obviously,
it's just doing simple math, pretty much
--
Keith
Maybe this helps https://wiki.python.org/moin/PythonSpeed/PerformanceTips ?
--
My fellow Pythonistas, ask not what our language can do for you, ask
what you can do for our language.
Mark Lawrence
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