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

Groups > comp.lang.python > #32235

Re: better way for ' '.join(args) + '\n'?

Show all headers | View raw

On 10/26/2012 05:26 PM, Tycho Andersen wrote:
> On Fri, Oct 26, 2012 at 09:49:50AM +0200, Ulrich Eckhardt wrote:
>> Hi!
>>
>> General advise when assembling strings is to not concatenate them
>> repeatedly but instead use string's join() function, because it
>> avoids repeated reallocations and is at least as expressive as any
>> alternative.
>>
>> What I have now is a case where I'm assembling lines of text for
>> driving a program with a commandline interface. In this scenario,
>> I'm currently doing this:
>>
>>   args = ['foo', 'bar', 'baz']
>>   line = ' '.join(args) + '\n'
> Assuming it's the length of the list that's the problem, not the
> length of the strings in the list...
>
> args = ['foo', 'bar', 'baz']
> args[-1] = args[-1] + '\n'
> line = ' '.join(args)
>
> \t

Main problem with that is the trailing space before the newline.  If
that's not a problem, then fine.

Not sure why we try so hard to optimize something that's going to take
negligible time.

-- 

DaveA

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

Thread

better way for ' '.join(args) + '\n'? Ulrich Eckhardt <ulrich.eckhardt@dominolaser.com> - 2012-10-26 09:49 +0200
  Re: better way for ' '.join(args) + '\n'? Peter Otten <__peter__@web.de> - 2012-10-26 10:58 +0200
  Re: better way for ' '.join(args) + '\n'? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-10-26 09:36 +0000
  Re: better way for ' '.join(args) + '\n'? Hubert Grünheidt <hgruenheidt@t-online.de> - 2012-10-26 18:21 +0200
  Re: better way for ' '.join(args) + '\n'? Tycho Andersen <tycho@tycho.ws> - 2012-10-26 16:26 -0500
  Re: better way for ' '.join(args) + '\n'? Dave Angel <d@davea.name> - 2012-10-26 17:36 -0400
  Re: better way for ' '.join(args) + '\n'? Tycho Andersen <tycho@tycho.ws> - 2012-10-26 16:42 -0500
    Re: better way for ' '.join(args) + '\n'? Ramchandra Apte <maniandram01@gmail.com> - 2012-11-03 01:26 -0700
    Re: better way for ' '.join(args) + '\n'? Ramchandra Apte <maniandram01@gmail.com> - 2012-11-03 01:26 -0700
  Re: better way for ' '.join(args) + '\n'? Thomas Rachel <nutznetz-0c1b6768-bfa9-48d5-a470-7603bd3aa915@spamschutz.glglgl.de> - 2012-10-27 11:26 +0200
    RE: better way for ' '.join(args) + '\n'? "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-10-29 22:28 +0000

csiph-web