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Re: sobering observation, python vs. perl

Path csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From Ethan Furman <ethan@stoneleaf.us>
Newsgroups comp.lang.python
Subject Re: sobering observation, python vs. perl
Date Thu, 17 Mar 2016 10:26:12 -0700
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On 03/17/2016 09:36 AM, Charles T. Smith wrote:

> Yes, your point was to forgo REs despite that they are useful.
> I could have thought the search would have been better as:
>
>      'release[-.:][Rr]eq'
>
> or something else ... you're in a "defend python at all costs!" mode.

No, I'm in the "don't try to write <language X> in Python" mode, and 
"don't use 10lb sledge when 6oz hammer will do" mode:

--------------------------------------------------------
# using `in` and printing line as each is found
real	0m1.703s
user	0m0.184s
sys	0m0.260s

# using `in` and printing lines at the end
real	0m0.217s
user	0m0.112s
sys	0m0.068s

# using 're' and printing lines at the end
real	0m0.608s
user	0m0.516s
sys	0m0.060s
--------------------------------------------------------

As you can see, how you print has a huge impact.  Hopefully you also 
noticed that using `re` when `in` would do made the script 3 times slower.

--------------------------------------------------------
# using `in` code
import sys
found = []
for fn in sys.argv[1:]:
    with open(fn) as fh:
       for line in fh:
          if 'timezone' in line:
             found.append(line)
print ''.join(found)
--------------------------------------------------------
# using `re` code
import sys
import re
found = []
for fn in sys.argv[1:]:
    with open(fn) as fh:
       for line in fh:
          if re.search('timezone', line):
             found.append(line)
print ''.join(found)
--------------------------------------------------------

--
~Ethan~

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Thread

sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 15:29 +0000
  Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 15:40 +0000
    Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 17:48 +0200
      Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 15:59 +0000
        Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 18:07 +0200
          Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:15 +0000
  Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 17:47 +0200
    Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:06 +0000
      Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 18:30 +0200
        Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:32 +0000
  Re: sobering observation, python vs. perl srinivas devaki <mr.eightnoteight@gmail.com> - 2016-03-17 21:18 +0530
    Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:15 +0000
  Re: sobering observation, python vs. perl Tim Chase <python.list@tim.thechases.com> - 2016-03-17 10:52 -0500
    Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:08 +0000
      Re: sobering observation, python vs. perl Ethan Furman <ethan@stoneleaf.us> - 2016-03-17 09:21 -0700
        Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:36 +0000
          Re: sobering observation, python vs. perl Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-17 17:09 +0000
          Re: sobering observation, python vs. perl Ethan Furman <ethan@stoneleaf.us> - 2016-03-17 10:26 -0700
            Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 17:35 +0000
              Re: sobering observation, python vs. perl Ethan Furman <ethan@stoneleaf.us> - 2016-03-17 11:21 -0700
          DSLs in perl and python (Was sobering observation) Rustom Mody <rustompmody@gmail.com> - 2016-03-17 10:47 -0700
            Re: DSLs in perl and python (Was sobering observation) Mark Lawrence <breamoreboy@yahoo.co.uk> - 2016-03-17 22:22 +0000
            Re: DSLs in perl and python (Was sobering observation) MRAB <python@mrabarnett.plus.com> - 2016-03-17 22:43 +0000
              Re: DSLs in perl and python (Was sobering observation) Rustom Mody <rustompmody@gmail.com> - 2016-03-18 05:57 -0700
                Re: DSLs in perl and python (Was sobering observation) Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-18 15:18 +0200
                Re: DSLs in perl and python (Was sobering observation) Peter Otten <__peter__@web.de> - 2016-03-18 14:22 +0100
                Re: DSLs in perl and python (Was sobering observation) Rustom Mody <rustompmody@gmail.com> - 2016-03-18 19:07 -0700
                DSL design (was DSLs in perl and python) Rustom Mody <rustompmody@gmail.com> - 2016-03-29 06:28 -0700
                Re: DSL design (was DSLs in perl and python) Chris Angelico <rosuav@gmail.com> - 2016-03-30 00:41 +1100
                Re: DSL design (was DSLs in perl and python) Jussi Piitulainen <jussi.piitulainen@helsinki.fi> - 2016-03-29 16:45 +0300
                Finding methods, was Re: DSL design (was DSLs in perl and python) Peter Otten <__peter__@web.de> - 2016-03-29 15:51 +0200
      Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 18:34 +0200
        Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 16:42 +0000
          Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 19:08 +0200
            Re: sobering observation, python vs. perl "Charles T. Smith" <cts.private.yahoo@gmail.com> - 2016-03-17 17:25 +0000
              Re: sobering observation, python vs. perl BartC <bc@freeuk.com> - 2016-03-17 17:53 +0000
                Re: sobering observation, python vs. perl Rustom Mody <rustompmody@gmail.com> - 2016-03-17 10:59 -0700
                Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 20:53 +0200
                Re: sobering observation, python vs. perl BartC <bc@freeuk.com> - 2016-03-17 19:06 +0000
                Re: sobering observation, python vs. perl Marko Rauhamaa <marko@pacujo.net> - 2016-03-17 21:11 +0200
            Re: sobering observation, python vs. perl Ben Bacarisse <ben.usenet@bsb.me.uk> - 2016-03-17 20:47 +0000
      Re: sobering observation, python vs. perl Peter Otten <__peter__@web.de> - 2016-03-18 10:26 +0100
      Re: sobering observation, python vs. perl Steven D'Aprano <steve@pearwood.info> - 2016-03-18 22:47 +1100

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