1.字典实例：建立学生学号成绩字典，做增删改查遍历操作。
dict={"01":"90","02":"91","03":"92","04":"94","05":"95","06":"96","07":"97","08":"98"}
print("查询02学号的成绩")
print(dict.get('02'))
print("删除07号的记录")
dict.pop('07')
print(dict.items())
print("将01的成绩改为100")
dict['01']=100
print(dict.items())
print("添加18号学生")
dict["18"]="100"
print(dict.items())
print("遍历:")
for i in dict:
print(i)
运行：
2.列表，元组，字典，集合的遍历。
总结列表，元组，字典，集合的联系与区别。
lis=["01","02","03","04"]
tu=("01","02","03","04","05")
dic={"01":"91","02":"92","03":"93","04":"94"}
s=set(lis)
for i in lis:
print(i)
for i in tu:
print(i)
for i in dic:
print('{0:<}:{1:>}'.format(i,dic[i]))
for i in s:
print(i)
运行：
答：列表是有序的元素集合，元组与列表很相像，但是最大的区别就是元组只能被读取而不能被修改。字典是以键值对作为单位来进行存放的集合。集合（set）则是一组key的无序集合，但是它只包含key，key值不能够重复，并且需要先创建一个List作为输入集合才能继续创建set。
3英文词频统计实例
bad='''your butt is mine
I Gonna tell you right
Just show your face
In broad daylight
I'm telling you
On how I feel
Gonna Hurt Your Mind
Don't shoot to kill
Shamone
Shamone
Lay it on me
All right
I'm giving you
On count of three
To show your stuff
Or let it be
I'm telling you
Just watch your mouth
I know your game
What you're about
Well they say the sky's the limit
And to me that's really true
But my friend you have seen nothin'
Just wait till I get through
Because I'm bad,I'm bad
shamone
(Bad,bad,really,really bad)
You know I'm bad,I'm bad
(Bad,bad,really,really bad)
You know it
You know I'm bad,I'm bad
Come on,you know
(Bad,bad,really,really bad)
And the whole world
Has to answer right now
Just to tell you once again
Who's bad
The word is out
You're doin' wrong
Gonna lock you up
Before too long
Your lyin' eyes
Gonna tell you right
So listen up
Don't make a fight
Your talk is cheap
You're not a man
Your throwin' stones
To hide your hands
Well they say the sky's the limit
And to me that's really true
But my friend you have seen nothin'
Just wait till I get through
Because I'm bad,I'm bad
shamone
(Bad,bad,really,really bad)
You know I'm bad,I'm bad
(Bad,bad,really,really bad)
You know it
You know I'm bad,I'm bad
Come on,you know
(Bad,bad,really,really bad)
And the whole world
Has to answer right now
Just to tell you once again
Who's bad
We could change the world tomorrow
This could be a better place
If you don't like what I'm sayin'
Then won't you slap my face
Because I'm bad'''
bad=bad.lower()
for i in ",.?!()":
bad=bad.replace(i,' ')
bad=bad.replace('
',' ')
words=bad.split(' ')
s=set(words)
dic={}
lis=[]
value=[]
for i in s:
if(i==" "):
continue
if(i==""):
continue
dic[i]=words.count(i)
lis.append(words.count(i))
value=dic.values()
lis=list (dic.items())
lis.sort(key=lambda x:x[1],reverse=True)
for i in range(10):
print(lis[i])
运行：
