Python学习笔记（4）——Python Lists and Dictionaries

突然发现我的博客竟然还有阅读量
是不是写的太随意了
哎呀 不管啦 写给自己看:p

5.

suitcase = ["sunglasses", "hat", "passport", "laptop", "suit", "shoes"]# The first and second items (index zero and one)first = suitcase[0:2]# Third and fourth items (index two and three)middle = suitcase[2:4]# The last two items (index four and five)last =  suitcase[4:6]

6

animals = "catdogfrog"# The first three characters of animalscat = animals[:3]# The fourth through sixth charactersdog = animals[3:6]# From the seventh character to the endfrog = animals[6:]

7.

animals = ["aardvark", "badger", "duck", "emu", "fennec fox"]duck_index = animals.index('duck') # Use index() to find "duck"# Your code here!animals.insert(duck_index,'cobra')print animals # Observe what prints after the insert operation

9.

start_list = [5, 3, 1, 2, 4]square_list = []# Your code here!for x in start_list:  square_list.append(x**2)square_list.sort()print square_list

12.

# key - animal_name : value - location zoo_animals = {  'Unicorn' : 'Cotton Candy House',  'Sloth' : 'Rainforest Exhibit',  'Bengal Tiger' : 'Jungle House',  'Atlantic Puffin' : 'Arctic Exhibit',  'Rockhopper Penguin' : 'Arctic Exhibit'}# A dictionary (or list) declaration may break across multiple lines# Removing the 'Unicorn' entry. (Unicorns are incredibly expensive.)del zoo_animals['Unicorn']# Your code here!del zoo_animals['Sloth']del zoo_animals['Bengal Tiger']zoo_animals['Rockhopper Penguin'] = 'anthing' #23333print zoo_animals

14.

inventory = {  'gold' : 500,  'pouch' : ['flint', 'twine', 'gemstone'], # Assigned a new list to 'pouch' key  'backpack' : ['xylophone','dagger', 'bedroll','bread loaf']}# Adding a key 'burlap bag' and assigning a list to itinventory['burlap bag'] = ['apple', 'small ruby', 'three-toed sloth']# Sorting the list found under the key 'pouch'inventory['pouch'].sort() # Your code hereinventory['pocket'] = ['seashell','strange berry','lint']inventory['backpack'].sort()inventory['backpack'].remove('dagger')inventory['gold'] += 50