Re: Pythonic love

From	justin walters <walters.justin01@gmail.com>
Newsgroups	comp.lang.python
Subject	Re: Pythonic love
Date	2016-03-08 08:49 -0800
Message-ID	<mailman.48.1457455785.15725.python-list@python.org> (permalink)
References	<nbl0lo$5o5$1@gioia.aioe.org> <nbmjrf$jrd$1@ger.gmane.org>

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Correct me if I'm wrong, but don't python generators usually use the yield
statement so they can be used in list comprehensions?
On Mar 8, 2016 5:27 AM, "jmp" <jeanmichel@sequans.com> wrote:

> On 03/07/2016 11:51 PM, Fillmore wrote:
>
>>
>> learning Python from Perl here. Want to do things as Pythonicly as
>> possible.
>>
>> I am reading a TSV, but need to skip the first 5 lines. The following
>> works, but wonder if there's a more pythonc way to do things. Thanks
>>
>> ctr = 0
>> with open(prfile,mode="rt",encoding='utf-8') as pfile:
>>      for line in pfile:
>>          ctr += 1
>>
>>          if ctr < 5:
>>              continue
>>
>>          allVals = line.strip().split("\t")
>>          print(allVals)
>>
>
> what about a generator expression ? The (not so)new hype:
>
> with open(prfile,mode="rt",encoding='utf-8') as pfile:
>   for values in (l.strip().split("\t") for (i, l) in enumerate(pfile) if i
> >=5):
>     print values
>
> slightly dense, could be better with a lambda function
>
> tovalues = lambda l: l.strip().split("\t")
> with open(prfile,mode="rt",encoding='utf-8') as pfile:
>   for values in (tovalues(l) for (i, l) in enumerate(pfile) if i >=5):
>     print values
>
>
> This should even work quite efficiently on big files, because I don't
> thing no more than one line is in memory at a given time.
>
> jm
>
>
>
>
> --
> https://mail.python.org/mailman/listinfo/python-list
>

Thread

Pythonic love Fillmore <fillmore_remove@hotmail.com> - 2016-03-07 17:51 -0500
  Re: Pythonic love Rob Gaddi <rgaddi@highlandtechnology.invalid> - 2016-03-07 22:52 +0000
  Re: Pythonic love sohcahtoa82@gmail.com - 2016-03-07 15:03 -0800
    Re: Pythonic love Fillmore <fillmore_remove@hotmail.com> - 2016-03-07 18:12 -0500
  Re: Pythonic love Ian Kelly <ian.g.kelly@gmail.com> - 2016-03-07 16:13 -0700
  Re: Pythonic love Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-07 23:19 +0000
  Re: Pythonic love jmp <jeanmichel@sequans.com> - 2016-03-08 14:25 +0100
  Re: Pythonic love justin walters <walters.justin01@gmail.com> - 2016-03-08 08:49 -0800
  Re: Pythonic love Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-08 16:55 +0000
  Re: Pythonic love jmp <jeanmichel@sequans.com> - 2016-03-08 18:00 +0100
  Re: Pythonic love justin walters <walters.justin01@gmail.com> - 2016-03-08 09:17 -0800
    Re: Pythonic love jstitch@invernalia.homelinux.net (Javier Novoa C.) - 2016-03-08 11:27 -0600
      Re: Pythonic love Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-03-08 21:10 -0500

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