ex39.py

#creat a mapping of state to abbreviation
states = {
    'Oregon': 'OR',
    'Florida': 'FL',
    'California': 'CA',
    'New York': 'NY',
    'Michigan': 'MI'
}

#create a basic set of states and some cities in them
cities ={
    'CA': 'San Francisco'
    'MI': 'Detroit',
    'FL': 'Jacksonville'
}

#add some more cities
cities['NY'] = 'Mew York'
cities['OR'] = 'portland'

#print out some cities
print '-' * 10
print "NY States has:", cities['NY']
print "OR States has:", cities['OR']

#print some States
print '-' * 10
print "Michigan's abbreviation is:", states['Michigan']
print "Florida's abbreviation is:", states['Florida']

#do it by using the state then cities dict
print '-' * 10
print "Michigan has:", cities[states['Michigan']]
print "Florida has:", cities[states['Florida']]

#print every state abbreviation
for state, abbrev in states.items():
    print "%s has the city %s" % (abbrev, city)

#now do both at the same time
print '-' * 10
for state, abbrev in states.items():
    print "%s state is abbreviated %s and has city %s" % (state, abbrev, cities[abbrev])

print '-' * 10
#safely get a abbreviation by state that might not be there
state = states.get('Texas')

if not state:
    print "sorry, no Texas."

#get a city with a default value
city = cities.get('TX', 'Does Not Exist')
print "The city for the state 'TX' is: %s" % city