作业9——文件方式实现完整的英文词频统计实例

1.读入待分析的字符串

fo=open('tt.txt','r')#以阅读方式打开文档tt.txt
news=fo.read()

2.分解提取单词 

news=news.lower()
for i in ',.-"':
    news=news.replace(i,' ')
words=news.split()

3.计数字典

dic={}
keys=set(words)

4.排除语法型词汇

exc={'the','a','to','of','and','in','that','on','this'}
keys=keys-exc#或者 for i in exc:  keys.remove(i)

5.排序

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

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

6.输出TOP(20)

for i in range(20):
    print(c[i])

fo.close()