From: Charles Oliver Nutter <charles.nutter@...>
Date: 2008-07-02T01:20:13+09:00
Subject: Re: Dynamic Variables

Igal Koshevoy wrote:
> # Python
> counter = 52
> eval(compile('box%s = "cat and dogs"' % counter, '<string>', 'exec'))
> print box52 # => "cat and dogs"
> 
> # Perl
> $counter = 52;
> eval("\$box$counter = 'cat and dogs'");
> print $box52, "\n"; # => "cat and dogs"

In python, local variables are not (necessarily) determined at 
parse/compile time. They're slots in a local scope that can grow later on.

In Ruby, this behavior only exists for eval scopes. Ruby 1.8 shares a 
single eval scope under any given normal scope across all evals in that 
normal scope. Ruby 1.9 instantiates a new eval scope for each eval.

I don't know what Perl does.

- Charlie