© # -*- coding: utf-8 -*-
©
© # in Python, there's a special type of
© # data structure called keyed list. it
© # is a unordered list of pairs, each
© # consists of a key and a value. It is
© # also known as dictionary.
©
© # define a keyed list
© aa = {'john':3, 'mary':4, 'jane':5, 'vicky':7}
© print aa
©
© # getting value from a key
© print 'mary is', aa['mary']
©
© # delete an entry
© del aa['vicky']
© print aa
©
© # get just the keys
© print aa.keys()
©
© # check if a key exists
© print aa.has_key('mar y')
©
© # to learn more,
© # type help() and DICTIONARIES
© # or see
© # http://python.org/doc/2.3.4/tut/node7.html
©
© -------------------------------------------
© # in perl, keyed-list is done like this:
©
© %a = ('john',3, 'mary', 4, 'jane', 5, 'vicky',7);
© use Data::Dumper qw(Dumper);
© print Dumper \%a;
©
© # the syntax of keyed list in Perl is too complex
© # to be covered in a short message.
© # see "perldoc perldata" for an unix-styled course.
©
© Xah
© xa*@xahlee.org
© http://xahlee.org/PageTwo_dir/more.html 6  1852 
"Xah Lee" <xa*@xahlee.org > wrote:
: # the syntax of keyed list in Perl is too complex
: # to be covered in a short message.
You've got to be joking. You couldn't even muster enough skill to provide
Perl equivalents for the four simple Python statements you showed?
: # see "perldoc perldata" for an unix-styled course.
It's good to see your opinion on the _fantastic incompetent writting_[1] of
Perl's documentation has changed enough that you can recommend it to
novices.
[1]Message-ID: <7f************ **************@ posting.google. com>
Xah Lee wrote: © # in perl, keyed-list is done like this:
Just FYI: those thingies are called hashes. The legacy name would be
associative array.
© %a = ('john',3, 'mary', 4, 'jane', 5, 'vicky',7);
© use Data::Dumper qw(Dumper);
© print Dumper \%a;
Wow, my compliments. The very first time that using Data::Dumper actually
may do something useful (formats the data more nicely). Still, why you are
passing a reference is beyond me.
© # the syntax of keyed list in Perl is too complex
© # to be covered in a short message.
Excuse me? If (using the same examples as for your Python section)
print "Mary is $a{mary}";
delete $a{vicky}; print %a;
print keys(%a);
exists $a{mary};
is too complex for your to cover, then I strongly suggest you stop posting
your "explanatio ns".
© # see "perldoc perldata" for an unix-styled course.
Excuse me? Do you mind explaining where exactly perldata is "Unix-styled"?
jue
Also sprach Jürgen Exner: Xah Lee wrote: © %a = ('john',3, 'mary', 4, 'jane', 5, 'vicky',7);
© use Data::Dumper qw(Dumper);
© print Dumper \%a;
Wow, my compliments. The very first time that using Data::Dumper actually
may do something useful (formats the data more nicely). Still, why you are
passing a reference is beyond me.
How else would you use 'Dumper' on a hash?
Tassilo
--
$_=q#",}])!JAPH!qq(tsuJ[{@"tnirp}3..0}_ $;//::niam/s~=)]3[))_$-3(rellac(=_$({
pam{rekcahbus}) (rekcah{lrePbus })(lreP{rehtona bus})!JAPH!qq(r ehtona{tsuJbus# ;
$_=reverse,s+(? <=sub).+q#q!'"q q.\t$&."'!#+sex isexiixesixeseg ;y~\n~~dddd;eva l
Jay Tilton wrote: : # the syntax of keyed list in Perl is too complex
: # to be covered in a short message.
JFTR: "keyed lists" are called dictionaries in Python.
[1]Message-ID: <7f************ **************@ posting.google. com>
This guy's wish-wash is starting to be funny, after all!
Reinhold
Jürgen Exner wrote: © # see "perldoc perldata" for an unix-styled course.
Excuse me? Do you mind explaining where exactly perldata is "Unix-styled"?
Remember: Perl == Unix == Satan.
Reinhold
Tassilo v. Parseval wrote: Also sprach Jürgen Exner:
Xah Lee wrote:
© %a = ('john',3, 'mary', 4, 'jane', 5, 'vicky',7);
© use Data::Dumper qw(Dumper);
© print Dumper \%a;
Wow, my compliments. The very first time that using Data::Dumper
actually may do something useful (formats the data more nicely).
Still, why you are passing a reference is beyond me.
How else would you use 'Dumper' on a hash?
Well, fair enough. If you do a plain
print Dumper(%a);
you do loose a lot of the nifty pretty printing that is provided by Dumper
otherwise.
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