Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #29518
| From | Terry Reedy <tjreedy@udel.edu> |
|---|---|
| Subject | Re: sum works in sequences (Python 3) |
| Date | 2012-09-19 14:49 -0400 |
| References | <franck-E8B1EB.16412019092012@news.free.fr> <scl6s.509699$Ax.328580@fx18.am4> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.936.1348080608.27098.python-list@python.org> (permalink) |
On 9/19/2012 11:07 AM, Alister wrote: > Summation is a mathematical function that works on numbers > Concatenation is the process of appending 1 string to another > > although they are not related to each other they do share the same > operator(+) which is the cause of confusion. If one represents counts in unary, as a sequence or tally of 1s (or other markers indicating 'successor' or 'increment'), then count addition is sequence concatenation. I think Guido got it right. It happens that when the members of all sequences are identical, there is a much more compact exponential place value notation that enables more efficient addition and other operations. When not, other tricks are needed to avoid so much copying that an inherently O(N) operation balloons into an O(N*N) operation. -- Terry Jan Reedy
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
sum works in sequences (Python 3) Franck Ditter <franck@ditter.org> - 2012-09-19 16:41 +0200
Re: sum works in sequences (Python 3) Joel Goldstick <joel.goldstick@gmail.com> - 2012-09-19 10:57 -0400
Re: sum works in sequences (Python 3) Neil Cerutti <neilc@norwich.edu> - 2012-09-19 14:57 +0000
Re: sum works in sequences (Python 3) Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-19 09:03 -0600
Re: sum works in sequences (Python 3) Neil Cerutti <neilc@norwich.edu> - 2012-09-19 15:06 +0000
Re: sum works in sequences (Python 3) Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-19 09:24 -0600
Re: sum works in sequences (Python 3) Steve Howell <showell30@yahoo.com> - 2012-09-19 08:37 -0700
Re: sum works in sequences (Python 3) Ian Kelly <ian.g.kelly@gmail.com> - 2012-09-19 12:33 -0600
Re: sum works in sequences (Python 3) Steve Howell <showell30@yahoo.com> - 2012-09-19 11:43 -0700
Re: sum works in sequences (Python 3) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-19 16:14 +0000
Re: sum works in sequences (Python 3) Alister <alister.ware@ntlworld.com> - 2012-09-19 15:07 +0000
Re: sum works in sequences (Python 3) Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-09-19 16:18 +0000
Re: sum works in sequences (Python 3) Terry Reedy <tjreedy@udel.edu> - 2012-09-19 14:49 -0400
Re: sum works in sequences (Python 3) Hans Mulder <hansmu@xs4all.nl> - 2012-09-20 00:25 +0200
csiph-web