组合数据类型练习，英文词频统计实例

1.列表实例：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。 

score = list('222331132')
print('分数为：'),score
print('得1分的同学个数：'),score.count('1')
print('得3分的同学个数：'),score.count('3')
print('第一个3分同学的下标为：'),score.index('3')
score.append('0')

 

 

2.字典实例：建立学生学号成绩字典，做增删改查遍历操作。

>>> d={'09':'66','05':'80','14':'78','23':'90'}
>>> d['23']
'90'
>>> d.keys()
dict_keys(['09', '05', '14', '23'])
>>> d.values()
dict_values(['66', '80', '78', '90'])
>>> d.items()
dict_items([('09', '66'), ('05', '80'), ('14', '78'), ('23', '90')])
>>> d.get('05')
'80'
>>> print(d.get('01','00'))
00
>>> d
{'09': '66', '05': '80', '14': '78', '23': '90'}
>>> d['01']='11'
>>> d
{'09': '66', '05': '80', '14': '78', '23': '90', '01': '11'}
>>> del(d['01'])
>>> d
{'09': '66', '05': '80', '14': '78', '23': '90'}

 

3、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。

 

l=list('1101010101')
t=tuple('1101010101')
s=set('1101010101')
d=dict(zip('abcd',[1,2,3,4]))
print('列表',l)
for i in l:
    print(i,end=' ')
print('\n')
print('元组',t)
for i in t:
    print(i,end=' ')
print('\n')
print('集合',s)
for i in s:
    print(i,end=' ')
print('\n')
print('字典',d)
for i in d:
    print(i,d[i])

 

4、英文词频统计实例

f=open('E:/作业/2017课程考核/Python/red.txt')
songs=f.read()
f.close()

songs =songs.replace("\n",' ')
exc={'the','a','to','of','and','in','that','on'}
songs=songs.lower()
for i in ',…':
    songs=songs.replace(i,' ')

print(songs)

words=songs.split(' ')
keys=set(words)
for w in exc:
    keys.remove(w)

dic={}
for i in keys:
    dic[i]=words.count(i)

wc=list(dic.items())
wc.sort(key=lambda x:x[1],reverse=True)

for j in range(10):
    print(wc[j])

 

待分析字符串

Loving him is like driving a new maserati down a dead end street
Faster than the wind, passionate as sin, ending so suddenly
Loving him is like trying to change your mind once you're already flying through the free fall
Like the colors in autumn so bright just before they lose it all

Losing him was blue, like I'd never known
Missing him was dark gray, all alone
Forgetting him was like trying to know somebody you've never met
But loving him was red
Loving him was red

Touching him was like realizing all you ever wanted was right there in front of you
Memorizing him was as easy as knowing all the words to your old favorite song
Fighting with him was like trying to solve a crossword and realizing there's no right answer
Regretting him was like wishing you never found out that love could be that strong

Losing him was blue, like I'd never known
Missing him was dark gray, all alone
Forgetting him was like trying to know somebody you never met
But loving him was red, oh red, burning red

Remembering him comes in flashbacks and echoes
Tell myself it's time now gotta let go
But moving on from him is impossible when I still see it all in my head…In burning red
Burning, it was red

Losing him was blue, like I'd never known
Missing him was dark gray, all alone
Forgetting him was like trying to know somebody you've never met
Cause loving him was red, yeah yeah red, burning red

And that’s why he’s spinning around in my head
Comes back to me in burning red
Loving him is like driving a new maserati down a dead end street

 

分解提取单词

 

大小写 txt.lower()

分隔符'.,:;?!-_’

计数字典

排除语法型词汇，代词、冠词、连词

排序list.sort()

输出TOP(10)