# 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']