using_dict.py

#!/usr/bin/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 address == 'swaroopch@byteofpython.info':
       del ab[name]
       print 'Delete %s sucsess' % name
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']
if ab.has_key('Guido'): # OR ab.has_key('Guido')
   print "\nGuido's address is %s" % ab['Guido']