笨办法学Python（learn python the hard way）--练习程序39-40

下面是练习39-练习40，基于python3

 #ex39.py
 1 ten_things = "Apples Oranges Crows Telephone Light Sugar"
 2 
 3 print("Wait there's not 10 things in that list,let's fix that.")
 4 
 5 stuff = ten_things.split(' ')
 6 
 7 more_stuff = ["Day", "Night", "Song", "Frisbee", "Corn", "Banana", "Girl", "Boy"]
 8 
 9 while len(stuff) != 10:
10     next_one = more_stuff.pop()
11     print("Adding: ", next_one)
12     stuff.append(next_one)
13     print("There's %d items now." % len(stuff))
14 
15 print("There we go: ", stuff)
16 
17 print("Let's do some things with stuff.")
18 
19 print(stuff[1])
20 print(stuff[-1]) # whoa! fancy
21 print(stuff.pop())
22 print(' '.join(stuff)) # what? cool!
23 print('#'.join(stuff[3:5])) # super stellar!

 #ex40.py
 1 # list
 2 
 3 things = ['a', 'b', 'c', 'd']
 4 print(things[1])
 5 
 6 things[1] = 'z'
 7 print(things[1])
 8 
 9 print(things)
10 
11 # dict
12 
13 stuff = {'name': 'Zed', 'age': 36, 'height': 6*12+2}
14 print(stuff['name'])
15 print(stuff['age'])
16 print(stuff['height'])
17 
18 stuff['city'] = "San Francisco"
19 print(stuff['city'])
20 
21 stuff[1] = "Wow"
22 stuff[2] = "Neato"
23 print(stuff[1])
24 print(stuff[2])
25 print(stuff)
26 
27 del stuff['city']
28 del stuff[1]
29 del stuff[2]
30 print(stuff)

 #ex40+.py
 1 # 练习
 2 
 3 cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}
 4 
 5 cities['NY'] = 'New York'
 6 cities['OR'] = 'Portland'
 7 
 8 print(cities)
 9 print(cities.values())
10 print(cities.keys())
11 print(cities.items())
12 
13 def find_city(themap, state):
14     if state in themap:
15         return themap[state]
16     else:
17         return "Not found."
18         
19 # ok pay attention!
20 cities['_find'] = find_city
21 
22 j = cities.keys()
23 for i in j:
24     city_found = cities[i] 
25     print(city_found)
26    
27 
28 while True:
29     print("State?(ENTER to quit)",end = '') 
30     state = input("> ")
31     
32     if not state: break
33     
34     # this line is the most important ever! study!
35     city_found = cities['_find'](cities,state)
36     print(city_found)