Python统计词频的几种方法小结
西西弗斯推石头 人气:0本文介绍python统计词频的几种方法,供大家参考
方法一:运用集合去重方法
def word_count1(words,n): word_list = [] for word in set(words): num = words.counts(word) word_list.append([word,num]) word_list.sort(key=lambda x:x[1], reverse=True) for i in range(n): word, count = word_list[i] print('{0:<15}{1:>5}'.format(word, count))
说明:运用集合对文本字符串列表去重,这样统计词汇不会重复,运用列表的counts方法统计频数,将每个词汇和其出现的次数打包成一个列表加入到word_list中,运用列表的sort方法排序,大功告成。
方法二:运用字典统计
def word_count2(words,n): 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(n): word, count = items[i] print("{0:<15}{1:>5}".format(word, count))
方法三:使用计数器
def word_count3(words,n): from collections import Counter counts = Counter(words) for ch in "": # 删除一些不需要统计的元素 del counts[ch] for word, count in counts.most_common(n): # 已经按数量大小排好了 print("{0:<15}{1:>5}".format(word, count))
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