#!/usr/bin/env ruby
# This code comes from http://ruby-it.org/pages/Hash+python-like
# Check the page for copyright notice and explanations



 >> hsh=Hash.new
 => {}
 >> hsh[0]
 => nil

 >>> hsh=dict()
 >>> hsh[0]
 Traceback (most recent call last):
   File "<stdin>", line 1, in ?
 KeyError: 0

 >> hsh=Hash.new {   raise 'Errore!' }
 => {}
 >> hsh[0]
 RuntimeError: Errore!
         from (irb):31
         from (irb):31:in `call'
         from (irb):32:in `default'
         from (irb):32:in `[]'
         from (irb):32
         from :0
 >> hsh[2]
 RuntimeError: Errore!
         from (irb):31
         from (irb):31:in `call'
         from (irb):33:in `default'
         from (irb):33:in `[]'
         from (irb):33
         from :0