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| Newsgroups | comp.lang.python |
| Date | Fri, 26 Oct 2012 08:42:54 -0700 (PDT) |
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| Subject | Re: bit count or bit set && Python3 |
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On Thursday, October 25, 2012 7:56:25 AM UTC-7, Charles Hixson wrote: > In Python3 is there any good way to count the number of on bits in an > integer (after an & operation)? You may want to look at gmpy2[1] and the popcount() function. > > Alternatively, is there any VERY light-weight implementation of a bit > set? I'd prefer to use integers, as I'm probably going to need > thousands of these, if the tests work out. But before I can test, I > need a decent bit counter. (shift, xor, &, and | are already present > for integer values, but I also need to count the number of "true" items > after the logical operation. So if a bitset is the correct approach, > Whether or not gmpy2 is considered light-weight is debateable. :) > I'll need it to implement those operations, or their equivalents in > terms of union and intersection.) > > > > Or do I need to drop into C for this? > [1] http://code.google.com/p/gmpy/ > > > -- > > Charles Hixson
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bit count or bit set && Python3 Charles Hixson <charleshixsn@earthlink.net> - 2012-10-25 07:47 -0700
Re: bit count or bit set && Python3 rusi <rustompmody@gmail.com> - 2012-10-25 09:13 -0700
Re: bit count or bit set && Python3 Terry Reedy <tjreedy@udel.edu> - 2012-10-25 16:16 -0400
Re: bit count or bit set && Python3 Christian Gollwitzer <auriocus@gmx.de> - 2012-10-25 19:25 +0200
Re: bit count or bit set && Python3 Ian Kelly <ian.g.kelly@gmail.com> - 2012-10-25 12:19 -0600
Re: bit count or bit set && Python3 casevh@gmail.com - 2012-10-26 08:42 -0700
Re: bit count or bit set && Python3 Charles Hixson <charleshixsn@earthlink.net> - 2012-10-26 09:30 -0700
Re: bit count or bit set && Python3 casevh@gmail.com - 2012-10-26 08:42 -0700
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