ex39.py

states = {
'oregonx':'or',
'florida':'fl',
'california':'ca',
'new york':'ny',
'michigan':'mi'
}

cities ={
'ca':'san francisco',
'mi':'detroit',
'fl':'jacksonville'
}

cities['ny'] = 'new york'
cities['or'] = 'portland'

print'-'*10
print "ny state has:",cities['ny']
print "or state has:",cities['or']

print'-'*10
print"michigan's abbreviation is:",states['florida']

print'-'*10
print "michigan has:",cities[states['michigan']]
print "michigan has:",cities[states['florida']]


print'-'*10
for state,abbrev in states.items():
    print"%s is abbreviated %s" %(state,abbrev)

print'-' * 10

for abbrev,city in cities.items():
    print"%s has the city %s" %(abbrev,city)


print'-' * 10
for state,abbrev in states.items():
    print "%s state is abbreviated %s and has city %s"%(
state,abbrev,cities[abbrev])


print'-' * 10
state = states.get('texas',None)

if not state:
    print "sorry ,no texas"

city = cities.get('tx','does not exist')
print"the city for the state 'tx' is: %s" %city