《笨方法學Python》加分題39

 1 # create a mapping of state to abbreviation
 2 
 3 states = {
 4     'Oregon': 'OR',
 5     'Florida': 'FL',
 6     'California': 'CA',
 7     'New York': 'NY',
 8     'Michigan': 'MI'
 9 }
10 
11 # create a basic set of states and some cities in them
12 
13 cities = {
14     'CA': 'San Francisco',
15     'MI': 'Detroit',
16     'FL': 'Jacksonville'
17 }
18 
19 # add some more cities
20 cities['NY'] = 'New York'
21 cities['OR'] = 'Portland'
22 
23 # print out some cities
24 print('-' * 10)
25 print("NY State has: ", cities['NY'])
26 print("OR State has: ", cities['OR'])
27 
28 # print some states
29 print('-' * 10)
30 print("Michigan's abbreviation is: ", states['Michigan'])
31 print("Florida's abbreviation is: ", states['Florida'])
32 
33 # do it by using the state then cities dict
34 print('-' * 10)
35 print("Michigan's has: ", cities[states['Michigan']])
36 print("Florida's has: ", cities[states['Florida']])
37 
38 # print every state abbreviation
39 print('-' * 10)
40 for state, abbrev in list(states.items()):
41     # print(list(states.items()))
42     print(f"{state} is abbreviated {abbrev}")
43 
44 # print every city in state
45 print('-' * 10)
46 for abbrev, city in list(cities.items()):
47     # print(list(cities.items()))
48     print(f"{abbrev} has the city {city}")
49 
50 # now do both at the same time
51 print('-' * 10)
52 for state, abbrev in list(states.items()):
53     print(f"{state} state is abbreviated {abbrev}")
54     print(f"and has city {cities[abbrev]}")
55 
56 print('-' * 10)
57 # safely get a abbreviation by state that might not be there
58 state = states.get('Texas')
59 
60 if not state:
61     print("Sorry, no Texas.")
62 
63 # get a city with a default value
64 city = cities.get('TX', 'Does Not Exist')
65 print(f"The city for the state 'TX' is: {city}")