#!/usr/bin/env python
# Filename: using_dict.py

# 'ab' is short for 'a'ddress'b'ook

ab={	'Swaroop'	: 'swaroopch@byteofpython.info',
	'Larry'		: 'larry@wall.org',
	'Matsumoto'	: 'matz@ruby-lang.org',
	'Spammer'	: 'spammer@hotmail.com'
   }

print "Swaroop's address is %s" %ab['Swaroop']

# Adding a key/value pair
ab['Guido']='guido@python.org'

# Deleting a key/value pair
del ab['Spammer']

print '\nThere are %d contacts in the address-book\n' %len(ab)
for name,address in ab.items():
	print 'Contact %s at %s' %(name,address)

if 'Guido' in ab: # OR ab.has_key('Guido')
	print "\nGuido's address is %s" %ab['Guido']