� # -*- 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('mary')
�
� # 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
� [EMAIL PROTECTED]
� http://xahlee.org/PageTwo_dir/more.html
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