习题38 列表的操作

# create a mapping of state to an 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'] = 'Poland'# 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', None)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)

习题39 字典，可爱的字典

class Song(object):def __init__(self, lyrics):self.lyrics = lyricsdef sing_me_a_song(self):for line in self.lyrics:print(line)happy_birthday = Song(["Happy birthday to you", "I don't want to get sued", "So I'll stop right there"])bulls_on_parade = Song(["They really around the family", "With pockets full of shells"])happy_birthday.sing_me_a_song()bulls_on_parade.sing_me_a_song()

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笨办法学Python3 习题39和习题40

习题38 列表的操作

习题39 字典，可爱的字典

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