9.20作业
（1）总结列表，元组，字典，集合的联系与区别。
列表：
可以用list()函数或者方括号[]创建，元素之间用逗号’,‘’分隔。
列表的元素不需要具有相同的类型
可以进行增删改查操作
元祖：
可以用tuple()函数或者方括号()创建，元素之间用逗号’,‘’分隔。
元组的元素不需要具有相同的类型
元素的值一旦创建就不可修改
字典：
元素由键（key）和值（value）组成
可以用dict()函数或者方括号()创建，元素之间用逗号’,‘’分隔，键与值之间用冒号”:”隔开
键必须是唯一的，但值则不必。值可以取任何数据类型，但键必须是不可变的，如字符串，数字或元组
使用键（key）来访问元素
集合：
可以用set()函数或者方括号{}创建，元素之间用逗号”,”分隔。
与字典相比少了键
不可以有重复元素
（2）列表，元组，字典，集合的遍历。
列表：
classmate=['Michael','Bob','luck','angle','李斯',55] new=['nance'] classmate[0] classmate[-1] classmate[0:3] classmate.insert(4,'gfds') classmate.append('fe') classmate.extend(new) classmate.pop() del classmate[0] # print(classmate) for stu in classmate: print(stu)
元组：
tuple=(("apple","banana"),("grape","orange"),("watermelon",),("grapefruit",)) for i in range(len(tuple)) : print(tuple[i],"")
字典和集合：
st = set('集合的遍历') #集合的遍历 print(st) for b in st: print(b) dt = {'a':80,'b':79,'c':90} #字典的遍历 print(dt) for i in dt: print(i,dt[i])
（3）英文词频统计：
str ='''There's a girl but I let her get away It's all my fault cause pride got in the way And I'd be lying if I said I was OK About that girl the one I let get away I keep saying no This can't be the way we're supposed to be I keep saying no There's gotta be a way to get you close to me Now I know you gotta Speak up if you want somebody Can't let him get away oh no You don't wanna end up sorry The way that I'm feeling everyday Don't you know No no no no There's no home for the broken heart Don't you know No no no no There's no home for the broken There's a girl but I let her get away It's my fault cause I said I needed space I've been torturing myself night and day About that girl the one I let get away I keep saying no This can't be the way we're supposed to be I keep saying no There's gotta be a way to get you Gotta be a way To get you close to me You gotta Speak up if you want somebody Can't let him get away oh no You don't wanna end up sorry The way that I'm feeling everyday Don't you know No no no no There's no home for the broken heart Don't you know No no no no There's no home for the broken No home for me No home cause I'm broken No room to breathe And I got no one to blame No home for me No home cause I'm broken About that girl The one I let get away So you better Speak up if you want somebody You can't let him get away no no You don't wanna end up sorry The way that I'm feeling everyday Don't you know No no no no There's no home for the broken heart Don't you know No no no no There's no home for the broken Oh You don't wanna lose at love It's only gonna hurt too much I'm telling you You don't wanna lose at love It's only gonna hurt too much I'm telling you You don't wanna lose at love Cause there's no home for the broken heart That girl The one I let get away ''' daxie = str.upper() jishu = str.count('no') print(str.split(' ')) print(daxie) print(jishu)
统计每个单词出现的次数 dict
