A deep dive into python -- Dictionaries

Definition and application definition

stuff = {'name': 'Zed', 'age': 36, 'height': 6*12+2}#key:value pairs

Instance

# create a mapping of state to abbreviationstates = {    'Oregon': 'OR',    'Florida': 'FL',    'California': 'CA',    'New York': 'NY',    'Michigan': 'MI'}# create a basic set of states and some cities in themcities = {    'CA': 'San Francisco',    'MI': 'Detroit',    'FL': 'Jacksonville'}# add some more citiescities['NY'] = 'New York'cities['OR'] = 'Portland'# print out some citiesprint '-' * 10print "NY State has: ", cities['NY']print "OR State has: ", cities['OR']# print some statesprint '-' * 10print "Michigan's abbreviation is: ", states['Michigan']print "Florida's abbreviation is: ", states['Florida']# do it by using the state then cities dictprint '-' * 10print "Michigan has: ", cities[states['Michigan']]print "Florida has: ", cities[states['Florida']]# print every state abbreviationprint '-' * 10for state, abbrev in states.items():    print "%s is abbreviated %s" % (state, abbrev)# print every city in stateprint '-' * 10for abbrev, city in cities.items():    print "%s has the city %s" % (abbrev, city)# now do both at the same timeprint '-' * 10for 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 therestate = states.get('Texas', None)if not state:    print "Sorry, no Texas."# get a city with a default valuecity = cities.get('TX', 'Does Not Exist')#if exist key=='TX',city=value,or city='Dose Not Exist'print "The city for the state 'TX' is: %s" % city

Output

----------NY State has:  New YorkOR State has:  Portland----------Michigan's abbreviation is:  MIFlorida's abbreviation is:  FL----------Michigan has:  DetroitFlorida has:  Jacksonville----------California is abbreviated CAMichigan is abbreviated MINew York is abbreviated NYFlorida is abbreviated FLOregon is abbreviated OR----------FL has the city JacksonvilleCA has the city San FranciscoMI has the city DetroitOR has the city PortlandNY has the city New York----------California state is abbreviated CA and has city San FranciscoMichigan state is abbreviated MI and has city DetroitNew York state is abbreviated NY and has city New YorkFlorida state is abbreviated FL and has city JacksonvilleOregon state is abbreviated OR and has city Portland----------Sorry, no Texas.The city for the state 'TX' is: Does Not Exist