组合数据类型练习，英文词频统计实例上

1、字典实例：建立学生学号成绩字典，做增删改查遍历操作。

 建立：

d={'0001':'99','0003':'89','0004':'98','0005':'100','0006':'78'}

增：
d['0002']='79'

删：
d.pop('0001')

改：
d['0004']=100

查：
print(d['0002'])

遍历操作：
for i in d:
    print(d)

2、列表，元组，字典，集合的遍历。

l=list('12438849374837')
for i in l:
    print(l)

t=tuple('nhaildhabvka')
for i in t:
    print(t)

d={'0001':'99','0003':'89','0004':'98','0005':'100','0006':'78'}
for i in d:
    print(d)

s=set(l)
for i in s:
    print(s)

总结列表，元组，字典，集合的联系与区别。

列表：是一组有序序列，能进行查询，增加，删除，修改。是用中括号【】括起来的。

元组：是一组有序序列，能进行查询。是用小括号（）括起来的。

字典：字典不是有序序列，是由一组组键值对组成。能进行增删改查等操作。是用大括号{}括起来的。

集合：集合也不是有序序列，能进行查询等操作。是用大括号{}括起来的。

3、英文词频统计实例

     （1）待分析字符串

 bin='''Put your make up on

Get your nails done

Curl your hair

Run the extra mile

Keep it slim

so they like you, do they like you?

Get your sexy on

Don't be shy, girl

Take it off

This is what you want, to belong, so they like you

Do you like you?

You don't have to try so hard

You don't have to, give it all away

You just have to get up, get up, get up, get up

You don't have to change a single thing

You don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to try

Yooou don't have to try

Oooh Oooh

Get your shopping on, at the mall, max your credit card

You don't have to choose, buy it all, so they like you

Do they like you?

Wait a second,Why, should you care, what they think of you

When you're all alone, by yourself, do you like you?

Do you like you?You don't have to try so hard

You don't have to, give it all away

You just have to get up, get up, get up, get up

You don't have to change a single thing

You don't have to try so hard

You don't have to bend until you break

You just have to get up, get up, get up, get up

You don't have to change a single thing

You don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to try

You don't have to try

You don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to tryYooou don't have to try

NooooOooh

You don't have to try so hard

You don't have to, give it all away

You just have to get up, get up, get up, get up

You don't have to change a single thing

You don't have to try, try, try, tryYou don't have to try, try, try, try

You don't have to try, try, try, try

You don't have to try

Take your make up off

Put your head down

Take a breath

Look into the mirror, at yourself.

Don't you like you?

Cause I like you!'''

     （2）分解提取单词

             大小写 txt.lower()

bin=bin.lower()

             分隔符'.,:;?!-_’

for i in ',.?!\n':
    bin=bin.replace(i,' ')

             单词列表

bin=bin.split(" ")

     （3）单词计数字典

words=set(bin)
d={}
d['star']=bin.count('star')
for a in words:
    d[a]=bin.count(a)
for a in d:
    print("{0:<11}{1}".format(a,d[a]))