组合数据类型练习，英文词频统计实例

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。

 1 fen = list('112332111223322331132233112233')
 2 print("第一个3分的下标为：",fen.index('3'))
 3 print("得到3分的人数为:",fen.count('3'))
 4 print("得到1分的人数为:",fen.count('1'))
 5 fen.append('5')
 6 print("尾部增加：",fen)
 7 fen.insert(2,'6')
 8 print("下标插入：",fen)
 9 fen.pop()
10 print("尾部删除：",fen)
11 fen.pop(2)
12 print("下标删除：",fen)

字典实例：建立学生学号成绩字典，做增删改查遍历操作。

1 mask = dict (zip('123456789','123321123'))
2 print(mask)
3 print("成绩查询：",mask.get('5'))
4 mask['4']='1'
5 print("成绩修改：",mask)
6 mask.pop('9')
7 print("删除学生：",mask)
8 mask['10']='3'
9 print("增加学生：",mask)

列表，元组，字典，集合的遍历。

 1 list1=list('adffedvfdgvcbvuyzwgh')
 2 tuple1=tuple('48685343867')
 3 d = dict (zip('wertyuiop','3217895640'))
 4 s = set(list1)
 5 print("列表：",list1)
 6 for i in list1:
 7     print(i,end=' ')
 8 print("\n")
 9 print("元组：",tuple1)
10 for i in tuple1:
11     print(i,end=' ')
12 print("\n")
13 print("字典：",d)
14 for i in d:
15     print(i,end='\t')
16     print(d[i],end='\n')
17 print("集合：")
18 for i in s:
19     print(i,end=' ')

英文词频统计实例

待分析字符串
分解提取单词
1. 大小写 txt.lower()
2. 分隔符'.,:;?!-_’
计数字典
1. 排除语法型词汇，代词、冠词、连词
排序list.sort()
输出TOP(10)

 1 of=open('young.txt','w')
 2 of.write('''We Are Young
 3 from Fun.
 4 by Shannon Yvox
 5 Give me a second I
 6 I need to get my story straight
 7 My friends are in the bathroom
 8 Getting higher than the Empire State
 9 My lover she's waiting for me
10 Just across the bar
11 My seats been taken by some sunglasses
12 Asking 'bout a scar
13 And I know I gave it to you months ago
14 I know you're trying to forget
15 But between the drinks and subtle things
16 The holes in my apologies
17 You know I'm trying hard to take it back
18 So if by the time the bar closes
19 And you feel like falling down
20 I'll carry you home
21 Tonight
22 We are young
23 So let's set the world on fire
24 We can burn brighter
25 Than the sun
26 Tonight
27 We are young
28 So let's set the world on fire
29 We can burn brighter
30 Than the sun
31 Now I know that I'm not
32 All that you got
33 I guess that I
34 I just thought maybe we could find new ways to fall apart
35 But our friends are back
36 So let's raise a cup
37 Cause I found someone to carry me home
38 Tonight
39 We are young
40 So let's the set the world on fire
41 We can burn brighter
42 Than the sun
43 Tonight
44 We are young
45 So let's set the world on fire
46 We can burn brighter
47 Than the sun
48 Carry me home tonight
49 Just carry me home tonight
50 Carry me home tonight
51 Just carry me home tonight
52 The world is on my side
53 I have no reason to run
54 So will someone come and carry me home tonight
55 The angels never arrived
56 But I can hear the choir
57 So will someone come and carry me home
58 Tonight
59 We are young
60 So let's set the world on fire
61 We can burn brighter
62 Than the sun
63 Tonight
64 We are young
65 So let's set the world on fire
66 We can burn brighter
67 Than the sun
68 So if by the time the bar closes
69 And you feel like falling down
70 I'll carry you home tonight''')
71 of.close()
72 fo=open('young.txt','r')
73 sw=fo.read()
74 sw=sw.lower()
75 exc={'the','in','to','and','if','are'}
76 for i in '''\t\\\'\"''':
77     sw=sw.replace(i,' ')
78 
79 words=sw.split(' ')
80 
81 s=set (words)
82 for j in exc:
83     s.remove(j)
84 number={}
85 for i in s:
86     number[i]=words.count(i)
87 
88 listnumber=list (number.items())
89 
90 listnumber.sort(key=lambda x:x[1],reverse=True)
91 for i in range(10):
92     print(listnumber.pop(i))