总结列表，元组，字典，集合的联系与区别：列表是以[ ]形式表示，元组是以( )表示，字典以{ }表示，集合则是以[()]的形式表示。列表和元组都是有序的，集合和字典是无序的。元组只可读，其他都可读写。字典是以键值对存储。集合中的元素不能重复，列表、元组和字典的元素均可重复。
列表
name = ['Linda', 'Lucy', '狗剩', '皮蛋', '狗剩']
print(name)
print(name[0])
len(name)
name.index('狗剩')
name[1]='Troy'
print(name)
name.sort()
print(name)
name.insert(1,'二蛋')
print(name)
name.append('狗屎')
print(name)
name.pop(1)
print(name)
del name[-1]
print(name)
运行结果
集合
s = {1, 2, 3}
print(s)
s.add(4)
print(s)
s.remove(2)
print(s)
s = set([1, 1, 2, 2, 3, 3])
print(s)
s1 = {1, 2, 3}
s2= {2, 3, 4}
print(s1&s2)
print(s1|s2)
print(s2-s1)
运行结果
英文歌词
英文词频统计：
- 下载一首英文的歌词或文章str
- 分隔出一个一个的单词 list
- 统计每个单词出现的次数 dict
strhello=''' Hello, it's me, I was wondering If after all these years you'd like to meet to go over everything They say that time's supposed to heal, yeah But I ain't done much healing Hello, can you hear me? I'm in California dreaming about who we used to be When we were younger and free I've forgotten how it felt before the world fell at our feet There's such a difference between us And a million miles Hello from the other side I must've called a thousand times To tell you I'm sorry, for everything that I've done But when I call you never seem to be home Hello from the outside At least I can say that I've tried To tell you I'm sorry, for breaking your heart But it don't matter, it clearly doesn't tear you apart anymore Hello, how are you? It's so typical of me to talk about myself, I'm sorry I hope that you're well Did you ever make it out of that town where nothing ever happened? It's no secret That the both of us are running out of time So hello from the other side I must've called a thousand times To tell you I'm sorry, for everything that I've done But when I call you never seem to be home Hello from the outside At least I can say that I've tried To tell you I'm sorry, for breaking your heart But it don't matter, it clearly doesn't tear you apart anymore Ooh, anymore Ooh, anymore Ooh, anymore Anymore... Hello from the other side I must've called a thousand times To tell you I'm sorry, for everything that I've done But when I call you never seem to be home Hello from the outside At least I can say that I've tried To tell you I'm sorry, for breaking your heart But it don't matter, it clearly doesn't tear you apart anymore''' strgc = strhello.replace('.',' ') strList = strhello.split() print(len(strList),strList) #分隔一个单词并统计英文单词个数 strSet = set(strList) #将列表转化成集合，再将集合转化成字典来统计每个单词出现次数 print(strSet) strDict={} for hello in strSet: strDict[hello] =strList.count(hello) print(strDict,len(strDict))
运行结果
