ex39.py

# -*- utf-8 -*-

#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 Texsa."

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