列表：由字符串创建一个作业评分列表，做增删改查询统计遍历操作。例如，查询第一个3分的下标，统计1分的同学有多少个，3分的同学有多少个等。

s=list('kkkkk')

s.insert(3,2)

s.pop(3)

s[6]=1

print(s)

print('第一个1的位置是：',s.index('1'))

x=0

y=0

for i in range(len(s)):

if s[i]=='3':

x=x+1

if x==1:

y=i

print('三分个数为：',x,' ','第一个三分位置是：',y)

print('二分个数为：',s.count('2'))

字典：建立学生学号成绩字典，做增删改查遍历操作。

>>> dic=dict(zip([1,2,3],['98','100','88']))

>>> dic

{1: '98', 2: '100', 3: '88'}

>>> dic2={4:'95'}

>>> dic.update(dic2)

>>> dic

{1: '98', 2: '100', 3: '88', 4: '95'}

>>> dic.pop(2)

'100'

>>> dic

{1: '98', 3: '88', 4: '95'}

>>> dic

{1: '120', 3: '88', 4: '95'}

>>> del dic[3]

>>> dic

{1: '120', 4: '95'}

>>> dic[1]='120'

>>> dic

{1: '120', 3: '88', 4: '95'}

>>> dic

{1: '98', 3: '88', 4: '95'}

>>> dic.get(4)

'95'

>>> dic.get(5,'没有')

'没有'

>>> dic[4]

'95'

>>> dic.keys()

dict_keys([1, 3, 4])

>>> dic.values()

dict_values(['98', '88', '95'])

>>> dic.items()

dict_items([(1, '98'), (3, '88'), (4, '95')])

dict

列表，元组，字典，集合的遍历。

s=list(‘456132798‘)

t=set(‘4561327489‘)

c={‘小明‘:‘1‘,‘小红‘:‘3‘,‘小华‘:‘2‘}

x=(1, 2, 3, 4, 5 )

print(‘列表的遍历为:‘,end=‘‘)

for i in s:

print(i,end=‘‘)

print()

print(‘元祖的遍历为:‘,end=‘‘)

for i in x:

print(i,end=‘‘)

print()

print(‘字典key的遍历为:‘,end=‘‘)

for i in c:

print(i,end=‘‘)

print()

print(‘字典value的遍历为:‘,end=‘‘)

for i in c.values():

print(i,end=‘‘)

print()

print(‘数组的遍历为:‘,end=‘‘)

for i in x:

print(i,end=‘‘)

'''

下载一首英文的歌词或文章，统计单词出现的次数，将所有,.？！替换为空格，将所有大写转换为小写。

'''

sr='''You're ?insecure

Don't know what for

You're turning heads through the door

Don't need make-up

to cover up

Being the way that you are is enough

Everyone else in the room can see it

Everyone else but you

Baby you light up my world like nobody else

The way that you flip your hair gets me overwhelmed

But when you smile at the ground it ain't hard to tell

You don't know Oh oh

You don't know you're beautiful

If only you saw what I can see

You'll understand why I want you so desperately

Right now I'm looking at you and I can't believe

You don't know Oh !oh

You don't know you're beautiful Oh oh

That's what makes you beautiful

So c-come on

You got it wrong

To prove I'm ,right '''

print(sr.count('you'))

for i in sr:

sr=sr.replace(',','/t ')

sr=sr.replace('!','/t ')

sr=sr.replace('?','/t ')

print(sr)

for i in sr:

sr=sr.upper()

print(sr)