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From: ccc31807 on 26 Mar 2010 11:23
On Mar 26, 7:25 am, Tad McClellan <ta...(a)seesig.invalid> wrote:
> #!/usr/bin/perl
> use warnings;
> use strict;
>
> my %cities;
> while ( <DATA> ) {
>     chomp;
>     my($country, $city) = split / \| /;
>     push @{ $cities{$country} }, $city;
>
> }
>
> foreach my $country ( sort keys %cities ) {
>     print "$country | ", join(', ', @{ $cities{$country} }), "\n";
>
> }
>
> __DATA__
> USA | Boston
> USA | Chicago
> USA | Seattle
> Ireland | Dublin
> Britain | London
> Britain | Liverpool
> -----------------------

I think this is the ideal solution. You might want to check to see
that city names with spaces (like 'New York' look like in the array.
The only thing I would add is that your data structure (in memory)
looks like this:
%cities = {
USA => [Boston Chicago Seattle],
Ireland => [Dublin],
Britain => [London Liverpool],
}

CC.
From: Peter J. Holzer on 27 Mar 2010 14:29
On 2010-03-26 13:48, J�rgen Exner <jurgenex(a)hotmail.com> wrote:
> Ninja Li <nickli2000(a)gmail.com> wrote:
>> I have a file with two fields, country and city and "|" delimiter.
>>Here are the sample formats:
>>
>> USA | Boston
>> USA | Chicago
>> USA | Seattle
>> Ireland | Dublin
>> Britain | London
>> Britain | Liverpool
>>
>> I would like to have the output like the following:
>> USA | Boston, Chicago, Seattle
>> Ireland | Dublin
>> Britain | London, Liverpool
>>
>> I tried to open the file, use temp variables to store and compare
>>the countries and it looks very cumbersome. Is there an easier way to
>>tackle this?
>
> As the cities are obviously grouped

You should always be wary about "obvious" patterns if all you have is a
six line example. It is entirely possible that the grouping is only by
chance and that the next line is "USA | Washington".

Never silently assume anything. If you spot a pattern, ask the customer
whether you can rely on this pattern, and if so, write it into the spec.

hp
From: J�rgen Exner on 27 Mar 2010 14:48
"Peter J. Holzer" <hjp-usenet2(a)hjp.at> wrote:
>On 2010-03-26 13:48, J�rgen Exner <jurgenex(a)hotmail.com> wrote:
>> Ninja Li <nickli2000(a)gmail.com> wrote:
>>> I have a file with two fields, country and city and "|" delimiter.
>>>Here are the sample formats:
>>>
>>> USA | Boston
>>> USA | Chicago
>>> USA | Seattle
>>> Ireland | Dublin
>>> Britain | London
>>> Britain | Liverpool
>>>
>>> I would like to have the output like the following:
>>> USA | Boston, Chicago, Seattle
>>> Ireland | Dublin
>>> Britain | London, Liverpool
>>>
>>> I tried to open the file, use temp variables to store and compare
>>>the countries and it looks very cumbersome. Is there an easier way to
>>>tackle this?
>>
>> As the cities are obviously grouped
>
>You should always be wary about "obvious" patterns if all you have is a
>six line example. It is entirely possible that the grouping is only by
>chance and that the next line is "USA | Washington".

Absolutely. That "obviously" was very much tounge in cheek.
Unfortunately I'm not aware of a well-known emoticon for
"tounge-in-cheek".

>Never silently assume anything. If you spot a pattern, ask the customer
>whether you can rely on this pattern, and if so, write it into the spec.

I was hoping my use of "obvious" made that, well, obvious.

jue
From: Jens Thoms Toerring on 27 Mar 2010 18:34
Jürgen Exner <jurgenex(a)hotmail.com> wrote:
> "Peter J. Holzer" <hjp-usenet2(a)hjp.at> wrote:
> >You should always be wary about "obvious" patterns if all you have is a
> >six line example. It is entirely possible that the grouping is only by
> >chance and that the next line is "USA | Washington".

> Absolutely. That "obviously" was very much tounge in cheek.
> Unfortunately I'm not aware of a well-known emoticon for
> "tounge-in-cheek".

Well, one could try use =>) or (<= - depending on which cheek
the tongue is in and from which direction you're looking at
it;-)
Regards, Jens
--
\ Jens Thoms Toerring ___ jt(a)toerring.de
\__________________________ http://toerring.de
From: ccc31807 on 27 Mar 2010 18:56
On Mar 27, 1:48 pm, Jürgen Exner <jurge...(a)hotmail.com> wrote:
> Absolutely. That "obviously" was very much tounge in cheek.
> Unfortunately I'm not aware of a well-known emoticon for
> "tounge-in-cheek".

I've always assumed that :P (or :-P) represented the 'tongue in cheek'
mode.

CC
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