How's ruby compare to it older brother python

[Carl Banks]

Re: Is Perl *that* good?

imbosol@aerojoc key.com (Carl Banks) wrote in message news:<60dfb6f6. 0404281459.2167 5af4@posting.go ogle.com>...[color=blue]
> In file x.pl:
>
> sub muck() {
> $_ = "sucker\n";
> }
>
> while(<>) {
> if (/^abc/) {
> muck();
> print $_;
> }
> }
>
> Command line:
>
> echo abcdefg | perl x.pl
>
> Output:
>
> sucker
>
>
> I had actually thought it restored $_.
> It never ceases to amaze me how bad Perl is.[/color]

Wait a minute, Perl does restore the regexp implicits.

In file x.pl:

sub muck() {
$_ = sucker;
/sucker/;
}

while(<>) {
if (/^abc/) {
muck();
print $&;
print "\n";
}
}

Command line:

echo abcdefg | perl x.pl

Output:

abc


Perl has failed to amaze me at just how bad
it is this one time. :)


--
CARL BANKS

[Carl Banks]

Re: Is Perl *that* good?

Peter Otten wrote:[color=blue]
> Wallclimber wrote:
>[color=green]
>> I have to agree with the original poster. My *only* complaint about
>> Python are not regex search, but regex search and replace operations.
>> Perl : s =~ s/(\w+)\s*=\s*(\d +)/$2 <= $1/g;
>> Python : regex.sub(s, "(\w+)\s*=\s*)\ d+)", (lambda m: m.group(2)+" <=
>> "+m.group(1 )))
>>
>> I didn't try this out so there might be some syntax problems in there,
>> but you get the idea. Is there a 'nicer' way to do this in python?[/color]
>
> Your example suggests that the Python equivalent for $1 is \1:
>[color=green][color=darkred]
>>>> re.sub(r"(\w+)\ s*=\s*(\d+)", r"\2 <= \1", "a=1 b = 3 c = d")[/color][/color]
> '1 <= a 3 <= b c = d'[/color]

You can do that? LSNED.


--
CARL BANKS http://www.aerojockey.com/software
"If you believe in yourself, drink your school, stay on drugs, and
don't do milk, you can get work."
-- Parody of Mr. T from a Robert Smigel Cartoon

[Martin Maney]

Re: Is Perl *that* good?

Peter Hansen <peter@engcorp. com> wrote:[color=blue]
> This is actually the first time in recent years that I can recall
> that someone has complained about having to make up a new variable
> (which is as good as free) to hold the result of a match. If[/color]

That's an odd way of characterizing it, since this is one of the common
forms of the FAQ more often discussed in terms of
assignment-as-operator, which used to come up about every week or so
back when I had the time to read more than an eclectic sampling of the
traffic here. The throwaway wrapper class is probably the least bad
solution - at least it can be used in thread-safe manner (1), unlike one
simply awful hack that's in the cookbook.


(1) use it as a wrapper that's instaniated locally and not shared,
which is the closest analog of how the code would go if operator= were
available, IMO&E. The bloody awful cookbook recipie is the one that
gains a little more convenience at the cost of a single globally shared
hidden variable.

--
Self-pity can make one weep, as can onions. -- Fodor