Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #31916

Re: get each pair from a string.

Show all headers | View raw

Le mardi 23 octobre 2012 06:59:49 UTC+2, rusi a écrit :
> On Oct 22, 9:19 pm, rusi <rustompm...@gmail.com> wrote:
> 
> > On 10/21/2012 11:33 AM, Vincent Davis wrote:
> 
> >
> 
> > > I am looking for a good way to get every pair from a string. For example,
> 
> > > input:
> 
> > > x = 'apple'
> 
> > > output
> 
> > > 'ap'
> 
> > > 'pp'
> 
> > > 'pl'
> 
> > > 'le'
> 
> >
> 
> > Maybe zip before izip for a noob?
> 
> >
> 
> > >>> s="apple"
> 
> > >>> [a+b for a,b in zip(s, s[1:])]
> 
> >
> 
> > ['ap', 'pp', 'pl', 'le']
> 
> 
> 
> Daniel wrote:
> 
> > This is a little bit faster:
> 
> >
> 
> > s = "apple"
> 
> > [s[i:i+2] for i in range(len(s)-1)]
> 
> 
> 
> Nice! I always find pairs of structural decomposition of input vs
> 
> recomposition of output interesting.
> 
> In this case the use of slices:
> 
> to decompose: s -> s[1:]
> 
> vs doing s[i:i+2]

Why bother with speeed?

The latest Python version is systematically slower
than the previous ones as soon as one uses non "ascii
strings".

Python users are discussing "code optimizations" without
realizing the tool they are using, has killed itself its
own performances.

(Replace 'apple' with 'ap需')

jmf

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Re: get each pair from a string. rusi <rustompmody@gmail.com> - 2012-10-22 09:19 -0700
  Re: get each pair from a string. rusi <rustompmody@gmail.com> - 2012-10-22 21:59 -0700
    Re: get each pair from a string. wxjmfauth@gmail.com - 2012-10-22 23:47 -0700
      Re: get each pair from a string. Neil Cerutti <neilc@norwich.edu> - 2012-10-23 12:30 +0000
      Re: get each pair from a string. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-10-23 13:44 +0100
      Re: get each pair from a string. Ian Kelly <ian.g.kelly@gmail.com> - 2012-10-23 10:41 -0600
        Re: get each pair from a string. wxjmfauth@gmail.com - 2012-10-24 02:32 -0700
          Re: get each pair from a string. Mark Lawrence <breamoreboy@yahoo.co.uk> - 2012-10-24 13:14 +0100
        Re: get each pair from a string. wxjmfauth@gmail.com - 2012-10-24 02:32 -0700

csiph-web