【初学python】实例九:词频统计
2019-01-25 14:59
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今天我们来统计一下一本书里面的一些关键字。
这里首先忽略了一个问题:这是一本什么书?中文?还是英文?
如果是英文,我们要解决的问题有很多:比如说大小写问题,标点符号问题等等,首先我们在网上下载一个全英的TXT文本(这里以莎士比亚的哈姆雷特为蓝本),然后我们给出代码:
#实例9:词频统计 def gettext(): txt = open("471228.txt","r",encoding="utf-8").read() txt = txt.lower() for ch in '|\/*-+.!@#$%^&*()''/.,?><"~`': txt = txt.replace(ch," ") return txt hamlettxt = gettext() words = hamlettxt.split() counts = {} for word in words: counts[word] = counts.get(word,0) +1 items = list(counts.items()) items.sort(key = lambda x:x[1],reverse = True) for i in range(10): word,count = items[i] print("{0:<10}{1:>5}".format(word,count))
运行效果:
类似的,我们给出中文版式的名著《三国演义》,要求统计人物姓名的出场次数,相比于英文版,这个比较简单,因为不存在大小写问题,这里我们引入了一个非常优秀的第三方库函数:jieba,如果我们按照上面的格式来编程:
#实例9:词频统计 import jieba txt = open("三国演义.txt","r",encoding = "gb18030").read() words = jieba.lcut(txt) counts = {} for word in words: if len(word) == 1: continue else: counts[word] = counts.get(word,0) + 1 items = list(counts.items()) items.sort(key = lambda x:x[1],reverse = True) for i in range(15): word,count = items[i] print("{0:<10}{1:>5}".format(word,count))
运行效果确是这样的:
我们发现:这里的很多词并不是人名,因此我们需要对程序进行改进:
1.将前十以内的不是人名的剔除
2.将同一个人的不同称呼与这个人相关联
于是 2.0 版本正式诞生:
#实例9:词频统计 import jieba txt = open("三国演义.txt","r",encoding = "gb18030").read() excludes = {"将军","却说","荆州","二人","不可","不能","如此","商议","如何","主公","军士","吕布","左右","军马","引兵","次日","大喜","天下","东吴","于是","不敢","人马","都督","一人","魏兵","陛下","今日"} words = jieba.lcut(txt) counts = {} for word in words: if len(word) ==1: continue elif word=="诸葛亮" or word == "孔明曰": rword = "孔明" elif word=="关公" or word == "关云长": rword = "关羽" elif word=="玄德" or word == "玄德曰": rword = "刘备" elif word=="孟德" or word == "丞相": rword = "曹操" else: rword = word counts[rword] = counts.get(rword,0) + 1 for word in excludes: del counts[word] items = list(counts.items()) items.sort(key = lambda x:x[1],reverse = True) for i in range(10): word,count = items[i] print("{0:<10}{1:>5}".format(word,count))
运行结果:重磅发布!三国演义前十名英雄人物!
同样的:
《西游记》呢?
《红楼梦》呢?
留给你做思考呦
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