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Groups > comp.lang.python > #19952
| From | Serhiy Storchaka <storchaka@gmail.com> |
|---|---|
| Subject | Re: difference between random module in python 2.6 and 3.2? |
| Date | 2012-02-07 12:05 +0200 |
| References | (6 earlier) <jgo3pp$269s$1@ns.felk.cvut.cz> <jgo4fg$26h9$1@ns.felk.cvut.cz> <4F302088.8010901@gmail.com> <mailman.5483.1328556387.27778.python-list@python.org> <jgpimq$2ndb$2@ns.felk.cvut.cz> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.5495.1328609155.27778.python-list@python.org> (permalink) |
07.02.12 00:06, Matej Cepl написав(ла):
> return seq[int(random.random() * len(seq))]
>
> doesn't seem like something so terrible (and maintenance intense). :)
_choice('abc') returns 'a' with probability P('a') = 1501199875790165/4503599627370496 = 1/3 - 1/13510798882111488 and 'b' with probability P('b') = 3002399751580331/9007199254740992 = 1/3 + 1/27021597764222976. P('b') - P('a') = 1/9007199254740992.
This may be acceptable for your application, but for applications that are concerned not only about the repeatability of results, but the accuracy and consistency with the results obtained by other (not Python) applications, it is better to get rid of such a notorious bias.
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difference between random module in python 2.6 and 3.2? Matej Cepl <mcepl@redhat.com> - 2012-02-06 02:27 +0100
Re: difference between random module in python 2.6 and 3.2? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-06 04:01 +0000
Re: difference between random module in python 2.6 and 3.2? Terry Reedy <tjreedy@udel.edu> - 2012-02-06 00:07 -0500
Re: difference between random module in python 2.6 and 3.2? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-06 05:56 +0000
Re: difference between random module in python 2.6 and 3.2? Terry Reedy <tjreedy@udel.edu> - 2012-02-06 02:27 -0500
Re: difference between random module in python 2.6 and 3.2? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-02-06 08:05 +0000
Re: difference between random module in python 2.6 and 3.2? Matej Cepl <mcepl@redhat.com> - 2012-02-06 09:45 +0100
Re: difference between random module in python 2.6 and 3.2? Matej Cepl <mcepl@redhat.com> - 2012-02-06 09:57 +0100
Re: difference between random module in python 2.6 and 3.2? Tim Chase <python.list@tim.thechases.com> - 2012-02-06 13:26 -0600
Re: difference between random module in python 2.6 and 3.2? Matej Cepl <mcepl@redhat.com> - 2012-02-06 23:06 +0100
Re: difference between random module in python 2.6 and 3.2? Serhiy Storchaka <storchaka@gmail.com> - 2012-02-07 12:05 +0200
Re: difference between random module in python 2.6 and 3.2? Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-02-07 16:11 +0100
Re: difference between random module in python 2.6 and 3.2? Mel Wilson <mwilson@the-wire.com> - 2012-02-06 10:20 -0500
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