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Groups > comp.lang.python > #105146
| From | Ben Bacarisse <ben.usenet@bsb.me.uk> |
|---|---|
| Newsgroups | comp.lang.python |
| Subject | Re: sobering observation, python vs. perl |
| Date | 2016-03-17 20:47 +0000 |
| Organization | A noiseless patient Spider |
| Message-ID | <87pousx25k.fsf@bsb.me.uk> (permalink) |
| References | (1 earlier) <mailman.274.1458230151.12893.python-list@python.org> <ncekqc$vpg$6@dont-email.me> <87twk5qd1d.fsf@elektro.pacujo.net> <ncempn$eav$4@dont-email.me> <87h9g5qbf9.fsf@elektro.pacujo.net> |
Marko Rauhamaa <marko@pacujo.net> writes:
> "Charles T. Smith" <cts.private.yahoo@gmail.com>:
>
>> Actually, I saw a study some years ago that concluded that python
>> could be both slower and faster than perl, but that perl had much less
>> deviation than python. I took that and accepted it, but was surprised
>> now that in exactly the field of application that I've traditionally
>> used perl, it really is better, er... faster.
>>
>> Furthermore, the really nice thing about python is its OO, but I've
>> really neglected looking into that with perl's OO capabilities.
>
> I haven't had such log processing needs as you, nor has it come down to
> performance in such a way. Do use the best tool for the job.
>
> (When it comes to freely formatted logs, gleaning information from them
> is somewhat of a lost cause. I've done my best to move to rigorously
> formatted logs that are much more amenable to post processing.)
>
> Perl might be strong on its home turf, but I am a minimalist and
> reductionist -- Perl was intentionally designed to be a maximalist,
> imitating the principles of natural languages. Python has concise,
> crystal-clear semantics that are convenient to work with.
>
> Compare Perl (<URL: http://www.perlmonks.org/?node_id=98357>):
>
> my $str = "I have a dream";
> my $find = "have";
> my $replace = "had";
> $find = quotemeta $find; # escape regex metachars if present
> $str =~ s/$find/$replace/g;
> print $str;
>
> with Python:
>
> print("I have a dream".replace("have", "had"))
If you know the strings are "have" and "had", you can just write
print 'I have a dream' =~ s/have/had/r;
but I think your point is to show up the lack of a string (rather than
regex) replace in Perl, so the strings should be considered arbitrarily
"dangerous". For that purpose it might have been better to give the
example as
print("I have a dream".replace(find, replace))
for which the closest Perl match is probably
print 'I have a dream' =~ s/\Q$find/$replace/r;
The closest to the actual line -- where you can just edit two strings
with your only concern being the end quote of the string -- would be
something like
my $find = 'have'; print 'I have a dream' =~ s{\Q$find}'had'r
I don't want to start a language war! I'm not saying that this is as
simple and clear as the Python, but a "compare X with Y" should try to
do the best by both X and Y.
--
Ben.
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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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