Re: Cutting a deck of cards
On Sun, May 26, 2013 at 12:16 PM, Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: list(range(13 * 4 * decks)) == range(13 * 4 * decks) Not in Python 3. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On Sun, May 26, 2013 at 12:17 PM, RVic rvinc...@gmail.com wrote: Ah, brilliant -- yes, this is so much more elegant in Python: #now cut the cards x = random.randrange(2,range(13 * 4 * decks)) cards = cards[x:]+cards[:x] Or if for some reason you want to do it in place: cards[x:], cards[:x] = cards[:x], cards[x:] But note that the order of assignments is subtly important there, so unless you have a good reason for doing that, it's probably better just to create a new list for clarity. -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
From: usenetm...@solar-empire.de Subject: Re: Cutting a deck of cards Date: Sun, 26 May 2013 22:13:55 +0200 To: python-list@python.org Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: From: usenetm...@solar-empire.de [...] Not in Python3.x decks = 6 list(range(13 * 4 * decks)) == range(13 * 4 * decks) False What does list(range(13 * 4 * decks)) returns in Python 3? A list of course. But Py3 range is very similar to Py2 xrange, it returns a range object. Adiaŭ Marc What list? '[[0,1,2,...]]' or '[0,1,2,...]'? If it's the later then it's no different than what range() returns in Python 2.7.5! -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
To: python-list@python.org From: breamore...@yahoo.co.uk [...] See this http://docs.python.org/3/whatsnew/3.3.html#pep-397-python-launcher-for-windows -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence Piece of cake! So, is there any risk of breaking anything if I install a new package after having both Puthon 2 and 3 installed? How do I choose which one will run the package? Will the package handle the settings accordingly or will I need to setup manually? -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On Mon, May 27, 2013 at 4:16 AM, Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: list(range(13 * 4 * decks)) == range(13 * 4 * decks) ;) Not in Python 3. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
and in fact will probably make it worse depending on how you choose the cutpoint. I'm pretty sure it won't. Otherwise you'd be lowering entropy by doing a random thing to a random thing. Doing a random thing to a random thing usually *does* lower entropy when the random things are actually deterministic algorithms that may have unexpected correlations. That's why you don't write your own PRNG unless you have a very good understanding of the math. If you are shuffling the deck with, say, numbers from random.org (which uses atmospheric noise), then cutting the deck afterward will have precisely 0 effect, since the (51 * 52!) possible outcomes include 51 copies of each of the 52! orderings, and so the odds of each end up the same. But if you're choosing the cutpoint by getting a value from the same PRNG you used to shuffle, there might very well be a correlation that makes some arrangements more likely than others. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 2013-05-26, RVic wrote: Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie The slice notation should be your friend here: random.shuffle(cards) cut_point = random.choice(xrange(len(cards))) cards = cards[cut_point :] + cards[: cut_point] -- Real (i.e. statistical) tennis and snooker player rankings and ratings: http://www.statsfair.com/ -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 31 May 2013 12:56, Lee Crocker leedanielcroc...@gmail.com wrote: Why on Earth would you want to? Cutting a deck makes no sense in software. Randomize the deck properly (Google Fisher-Yates) and start dealing. Cutting the deck will not make it any more random, True and in fact will probably make it worse depending on how you choose the cutpoint. I'm pretty sure it won't. Otherwise you'd be lowering entropy by doing a random thing to a random thing. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
Why on Earth would you want to? Cutting a deck makes no sense in software. Randomize the deck properly (Google Fisher-Yates) and start dealing. Cutting the deck will not make it any more random, and in fact will probably make it worse depending on how you choose the cutpoint. The purpose of cutting cards is to make it more difficult for human dealers to stack a deck. Simulating it in software makes no more sense than simulating the cigars you smoke while playing. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
Why on Earth would you want to? Cutting a deck makes no sense in software. Randomize the deck properly (Google Fisher-Yates) and start dealing. Cutting the deck will not make it any more random, and in fact will probably make it worse depending on how you choose the cutpoint. The purpose of cutting cards is to make it more difficult for human dealers to stack a deck. Simulating it in software makes no more sense than simulating the cigars you smoke while playing. Perhaps the OP wanted to study the efficiency and affect of a real-world shuffling algorithm :-p Maybe he was designing a probabilistic magic trick and needed to evaluate how a cut would modify the outcome of a particular stack. Maybe it was a school assignment. Who knows? (But yeah if the purpose was for pure randomization then there's no real point.) There could be a lot of legitimate reasons though. -Modulok- -- http://mail.python.org/mailman/listinfo/python-list
Cutting a deck of cards
Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 26/05/2013 18:52, RVic wrote: Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie The list from its start up to, but excluding, index 'i' is cards[ : i], and the list from index 'i' to its end is cards[i : ]. Now concatenate them those slices. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
I guess, you will have to use list slicing mechanism to achieve the desired result. Hope this helps, Cheers, Kamlesh On Sun, May 26, 2013 at 11:22 PM, RVic rvinc...@gmail.com wrote: Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie -- http://mail.python.org/mailman/listinfo/python-list -- Faith waiting in the heart of a seed promises a miracle of life which it can not prove! -Ravindranath Tagore -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
Date: Sun, 26 May 2013 10:52:14 -0700 Subject: Cutting a deck of cards From: rvinc...@gmail.com To: python-list@python.org Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie -- http://mail.python.org/mailman/listinfo/python-list list(range(13 * 4 * decks)) == range(13 * 4 * decks) ;) -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
Ah, brilliant -- yes, this is so much more elegant in Python: #now cut the cards x = random.randrange(2,range(13 * 4 * decks)) cards = cards[x:]+cards[:x] -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
In article 4d02f46f-8264-41bf-a254-d1c204696...@googlegroups.com, RVic rvinc...@gmail.com wrote: Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie import random i = random.randrange(len(cards)) cut1 = cards[:i] cut2 = cards[i:] I haven't thought too much about the boundary conditions, but that's the general idea. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: Date: Sun, 26 May 2013 10:52:14 -0700 Subject: Cutting a deck of cards From: rvinc...@gmail.com To: python-list@python.org Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie -- http://mail.python.org/mailman/listinfo/python-list list(range(13 * 4 * decks)) == range(13 * 4 * decks) ;) Not in Python3.x decks = 6 list(range(13 * 4 * decks)) == range(13 * 4 * decks) False Adiaŭ Marc -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
From: usenetm...@solar-empire.de [...] Not in Python3.x decks = 6 list(range(13 * 4 * decks)) == range(13 * 4 * decks) False Adiaŭ Marc What does list(range(13 * 4 * decks)) returns in Python 3? -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: From: usenetm...@solar-empire.de [...] Not in Python3.x decks = 6 list(range(13 * 4 * decks)) == range(13 * 4 * decks) False What does list(range(13 * 4 * decks)) returns in Python 3? A list of course. But Py3 range is very similar to Py2 xrange, it returns a range object. Adiaŭ Marc -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 5/26/2013 3:54 PM, Carlos Nepomuceno wrote: From: usenetm...@solar-empire.de [...] Not in Python3.x decks = 6 list(range(13 * 4 * decks)) == range(13 * 4 * decks) False Adiaŭ Marc What does list(range(13 * 4 * decks)) returns in Python 3? A list, obviously. What you should ask is what range returns in Python 3, and you should install python 3 and try it, and list its attributes. -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 26/05/2013 19:16, Carlos Nepomuceno wrote: Date: Sun, 26 May 2013 10:52:14 -0700 Subject: Cutting a deck of cards From: rvinc...@gmail.com To: python-list@python.org Suppose I have a deck of cards, and I shuffle them import random cards = [] decks = 6 cards = list(range(13 * 4 * decks)) random.shuffle(cards) So now I have an array of cards. I would like to cut these cards at some random point (between 1 and 13 * 4 * decks - 1, moving the lower half of that to the top half of the cards array. For some reason, I can't see how this can be done (I know that it must be a simple line or two in Python, but I am really stuck here). Anyone have any direction they can give me on this? Thanks, RVic, python newbie -- http://mail.python.org/mailman/listinfo/python-list list(range(13 * 4 * decks)) == range(13 * 4 * decks) ;) Wrong if you're using Python 3 :( -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
To: python-list@python.org From: breamore...@yahoo.co.uk [...] Wrong if you're using Python 3 :( -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence Thanks guys! I've been delaying my dive into Python 3 (because I don't need it for now) but I'd like to run some code just to learn how different it is from Python 2 and even other Python flavors. So, I'd like to know if it's possible to have multiple Python installations on the same machine (Windows 7 in my particular case) without messing one with each other. What care must I take not to mess up with them? I've just found this[1] awesome service, but ridiculously it's PHP powered!!! lol Come on!!! Why there aren't more Python powered websites available? What's the catch? [1] http://www.compileonline.com/execute_python3_online.php -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On Mon, May 27, 2013 at 8:30 AM, Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: Thanks guys! I've been delaying my dive into Python 3 (because I don't need it for now) but I'd like to run some code just to learn how different it is from Python 2 and even other Python flavors. So, I'd like to know if it's possible to have multiple Python installations on the same machine (Windows 7 in my particular case) without messing one with each other. What care must I take not to mess up with them? Easy. Just grab the standard installer and hit it. You'll get two separate directories (or more; I have \Python26, \Python27, \Python32, \Python33 on this box), and you can run whichever you want. The one thing to take care of is .py associations; I haven't actually done it (on here, all I actually do is IDLE, pretty much), but as of 3.3, you should be able to use a Unix-style shebang to indicate which Python you want to invoke. ChrisA -- http://mail.python.org/mailman/listinfo/python-list
RE: Cutting a deck of cards
Date: Mon, 27 May 2013 08:42:56 +1000 Subject: Re: Cutting a deck of cards From: ros...@gmail.com [...] Easy. Just grab the standard installer and hit it. You'll get two separate directories (or more; I have \Python26, \Python27, \Python32, \Python33 on this box), and you can run whichever you want. The one thing to take care of is .py associations; I haven't actually done it (on here, all I actually do is IDLE, pretty much), but as of 3.3, you should be able to use a Unix-style shebang to indicate which Python you want to invoke. ChrisA I'm not even using shebangs in Windows because I thought it wouldn't make any difference. I'm used to run scripts like python filename.py from the command line. No problem! So, Python 3.3 will honor if I insert #!C:\Python27\python.exe? if I install it after Python 2.7? Cool!!! -- http://mail.python.org/mailman/listinfo/python-list
Re: Cutting a deck of cards
On 26/05/2013 23:42, Chris Angelico wrote: On Mon, May 27, 2013 at 8:30 AM, Carlos Nepomuceno carlosnepomuc...@outlook.com wrote: Thanks guys! I've been delaying my dive into Python 3 (because I don't need it for now) but I'd like to run some code just to learn how different it is from Python 2 and even other Python flavors. So, I'd like to know if it's possible to have multiple Python installations on the same machine (Windows 7 in my particular case) without messing one with each other. What care must I take not to mess up with them? Easy. Just grab the standard installer and hit it. You'll get two separate directories (or more; I have \Python26, \Python27, \Python32, \Python33 on this box), and you can run whichever you want. The one thing to take care of is .py associations; I haven't actually done it (on here, all I actually do is IDLE, pretty much), but as of 3.3, you should be able to use a Unix-style shebang to indicate which Python you want to invoke. ChrisA See this http://docs.python.org/3/whatsnew/3.3.html#pep-397-python-launcher-for-windows -- If you're using GoogleCrap™ please read this http://wiki.python.org/moin/GoogleGroupsPython. Mark Lawrence -- http://mail.python.org/mailman/listinfo/python-list
