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"

print("Wait there's not 10 things in that list,let's fix that.")

stuff = ten_things.split(' ')

more_stuff = ["Day", "Night", "Song", "Frisbee", "Corn", "Banana", "Girl", "Boy"]

while len(stuff) != 10:
    next_one = more_stuff.pop()
    print("Adding: ", next_one)
    stuff.append(next_one)
    print("There's %d items now." % len(stuff))

print("There we go: ", stuff)

print("Let's do some things with stuff.")

print(stuff[1])
print(stuff[-1]) # whoa! fancy
print(stuff.pop())
print(' '.join(stuff)) # what? cool!
print('#'.join(stuff[3:5])) # super stellar!

 

 #ex40.py
 1 # list

things = ['a', 'b', 'c', 'd']
print(things[1])

things[1] = 'z'
print(things[1])

print(things)

# dict

stuff = {'name': 'Zed', 'age': 36, 'height': 6*12+2}
print(stuff['name'])
print(stuff['age'])
print(stuff['height'])

stuff['city'] = "San Francisco"
print(stuff['city'])

stuff[1] = "Wow"
stuff[2] = "Neato"
print(stuff[1])
print(stuff[2])
print(stuff)

del stuff['city']
del stuff[1]
del stuff[2]
print(stuff)

 

 #ex40+.py
 1 # 练习

cities = {'CA': 'San Francisco', 'MI': 'Detroit', 'FL': 'Jacksonville'}

cities['NY'] = 'New York'
cities['OR'] = 'Portland'

print(cities)
print(cities.values())
print(cities.keys())
print(cities.items())

def find_city(themap, state):
    if state in themap:
        return themap[state]
    else:
        return "Not found."
        
# ok pay attention!
cities['_find'] = find_city

j = cities.keys()
for i in j:
    city_found = cities[i] 
    print(city_found)
   

while True:
    print("State?(ENTER to quit)",end = '') 
    state = input("> ")
    
    if not state: break
    
    # this line is the most important ever! study!
    city_found = cities['_find'](cities,state)
    print(city_found)