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

# create a basic set of sttes 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 "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)

# noew 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 none
state = states.get('Texas',None)

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

# get a city with a fefault value

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


add ex39