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Re: Looking under Python's hood: Will we find a high performance or clunky engine?

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On 01/22/2012 08:50 AM, Rick Johnson wrote:
> 
> What does Python do when presented with this code?
> 
> py> [line.strip('\n') for line in f.readlines()]
> 
> If Python reads all the file lines first and THEN iterates AGAIN to do
> the strip; we are driving a Fred flintstone mobile. If however Python
> strips each line of the lines passed into readlines in one fell swoop,
> we made the correct choice.
> 
> Which is it Pythonistas? Which is it?

You're doing it wrong, obviously.  I'm actually surprised that an expert
such as yourself would read a file in this way.  In any language.
Surely you would iterate over the file object which is the obvious way
to do it.

I guess we'll chalk this up as another python pitfall.  Looking forward
to your programming language which will prevent such things while
maintaining the purity and beauty of Python's ideals.

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Thread

Looking under Python's hood: Will we find a high performance or clunky engine? Rick Johnson <rantingrickjohnson@gmail.com> - 2012-01-22 07:50 -0800
  Re: Looking under Python's hood: Will we find a high performance or clunky engine? Heiko Wundram <modelnine@modelnine.org> - 2012-01-22 18:52 +0100
  Re: Looking under Python's hood: Will we find a high performance or clunky engine? Robert Kern <robert.kern@gmail.com> - 2012-01-22 18:01 +0000
    Re: Looking under Python's hood: Will we find a high performance or clunky engine? 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-23 10:56 -0800
    Re: Looking under Python's hood: Will we find a high performance or clunky engine? 88888 Dihedral <dihedral88888@googlemail.com> - 2012-01-23 10:56 -0800
      Re: Looking under Python's hood: Will we find a high performance or clunky engine? alex23 <wuwei23@gmail.com> - 2012-01-23 22:44 -0800
        Re: Looking under Python's hood: Will we find a high performance or clunky engine? Chris Angelico <rosuav@gmail.com> - 2012-01-24 19:14 +1100
  Re: Looking under Python's hood: Will we find a high performance or clunky engine? Michael Torrie <torriem@gmail.com> - 2012-01-22 17:38 -0700
    Re: Looking under Python's hood: Will we find a high performance or clunky engine? Rick Johnson <rantingrickjohnson@gmail.com> - 2012-01-22 17:04 -0800
      Re: Looking under Python's hood: Will we find a high performance or clunky engine? Michael Torrie <torriem@gmail.com> - 2012-01-22 18:32 -0700
  Re: Looking under Python's hood: Will we find a high performance or clunky engine? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-01-23 09:11 +0000
  Re: Looking under Python's hood: Will we find a high performance or clunky engine? Grant Edwards <invalid@invalid.invalid> - 2012-01-23 16:08 +0000

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