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> Subject: Re: [Tutor] First code snipet<BR>> From: andreas@kostyrka.org<BR>> To: darthkaboda@msn.com<BR>> CC: tutor@python.org<BR>> Date: Sun, 26 Jul 2009 03:02:27 +0200<BR>> <BR>> Some things:<BR>> <BR>> 1) It's Python, not Phython.<BR>> 2) Slightly shorter solution to your problem:<BR>> <BR>> import random<BR>> <BR>> input = range(53)<BR>> random.shuffle(input)<BR>> print input<BR>> <BR>> 3) The important part here is that reimplementing something that is in<BR>> the standard library does not make sense usually.<BR>> <BR>> 4) A more sensible implementation of shuffle comes directly out of<BR>> random.py:<BR>> <BR>> def shuffle(self, x, random=None, int=int):<BR>> """x, random=random.random -> shuffle list x in place; return<BR>> None.<BR>> <BR>> Optional arg random is a 0-argument function returning a random<BR>> float in [0.0, 1.0); by default, the standard random.random.<BR>> """<BR>> <BR>> if random is None:<BR>> random = self.random<BR>> for i in reversed(xrange(1, len(x))):<BR>> # pick an element in x[:i+1] with which to exchange x[i]<BR>> j = int(random() * (i+1))<BR>> x[i], x[j] = x[j], x[i]<BR>> <BR>> Notice that it is not exactly optimal, one could easily replace the<BR>> reversed(xrange()) expression with a 3 parameter version of xrange:<BR>> for i in xrange(len(x) - 1, 0, -1):<BR>> <BR>> Andreas<BR>> <BR>> <BR>> <BR>> Am Samstag, den 25.07.2009, 17:15 -0700 schrieb Darth Kaboda:<BR>> > I'm starting to learn Python as it seems to be adopted by many<BR>> > companies that I've been looking to apply to. I used the book Learning<BR>> > Phython to get the basics of the language and many of the gotcha's. I<BR>> > think I know enough of the basic features of the language to start<BR>> > playing around and can understand most code I've seen so far by<BR>> > looking at some of the posts here.<BR>> > <BR>> > The one worry I have is not coding things the Phython way as I've been<BR>> > a Visual Basic programmer for so long and a C++ programmer before<BR>> > that. So would like to have people look at a simplistic class<BR>> > (shuffles lists of objects wrote it for shuffling cards but<BR>> > with Phython could be used for any "list" type object) I wrote to give<BR>> > me some feedback on the style of it.<BR>> > <BR>> > Any feedback is appreciated.<BR>> > <BR>> > Thanks,<BR>> > Brian<BR>> > _______________________________________________<BR>> > Tutor maillist - Tutor@python.org<BR>> > <A href="http://mail.python.org/mailman/listinfo/tutor">http://mail.python.org/mailman/listinfo/tutor</A><BR>
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Thanks for the correction not sure why I typed it that way after typing it correctly in the first sentence, must have wondered off somewhere in my mind I guess. <BR>
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Oops I guess I should have also mentioned what I was trying to accomplish with this class. I wanted to mimic how a deck of cards get's shuffled in the real world. i.e. split the deck and shuffle the two halves together. <BR>
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Brian<BR>
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