ex39.py

# create 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'] = 'New York'
cities['OR'] = 'Portland'

# print out some cities
print '-' * 10
print 'NY State has: ', cities['NY']
print 'OR State 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
print '-' * 10
for state, abbrev in states.items():
    print "%s is abbreviated %s" % (state, abbrev)

# print every city in state
print '-' * 10
for abbrev, city in cities.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