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