可以下载一长篇的英文小说，进行词频的分析。
1.读入待分析的字符串
2.分解提取单词
3.计数字典
4.排除语法型词汇
5.排序
6.输出TOP(20)
7.对输出结果的简要说明。
song='''It's been a long day without you my friend And I'll tell you all about it when I see you again We've come a long way from where we began Oh I'll tell you all about it when I see you again When I see you again Damn, who knew all the planes we flew? Good things we've been through That I'll be standing right here Talking to you about another path I know we loved to hit the road and laugh But something told me that it wouldn't last Had to switch up look at things different see the bigger picture Those were the days hard work forever pays Now I see you win the better place How could we not talk about family when family's all that we got? Everything I went through you were standing there by my side And now you gonna be with me for the last ride It's been a long day without you my friend And I'll tell you all about it when I see you again We've come a long way from where we began Oh I'll tell you all about it when I see you again When I see you again First you both go out your way? And the vibe is feeling strong and what's small turn to a friendship Turn into a bond and that bond will never be broken and the love will never get lost And when brotherhood come first then the line Will never be crossed established it on our own When that line had to be drawn and that line is what? We reach so remember me when I'm gone How could we not talk about family when family's all that we got? Everything I went through you were standing there by my side And now you gonna be with me for the last ride So let the light guide your way Hold every memory as you go And every road you take will always lead you home Hoo? It's been a long day without you my friend? And I'll tell you all about it when I see you again We've come a long way from where we began Oh I'll tell you all about it when I see you again When I see you again When I see you again, see you again When I see you again''' a=open('ph.txt','r') song=a.read() a.close() song=song.lower()#字符串处理，把大写换成小写 for i in '?': song=song.replace(i,' ')#把'?'换成' ' words=song.split(' ')#单词的分隔 exp={'the','to','and','were','i','we','you','be','a'}#不统计单词的集合 dic={} key=set(words)-exp#键的集合 for y in key: dic[y]=words.count(y)#计算单词的个数 yz=list(dic.items())#（单词，计数）元组的列表 yz.sort(key= lambda x:x[1],reverse=True)#对列表进行排序 for i in range(20):#输出前20个出现次数最多的单词 print(yz[i]
