python統(tǒng)計(jì)單詞出現(xiàn)次數(shù)

做單詞詞頻統(tǒng)計(jì)，用字典無疑是最合適的數(shù)據(jù)類型，單詞作為字典的key， 單詞出現(xiàn)的次數(shù)作為字典的 value，很方便地就記錄好了每個(gè)單詞的頻率，字典很像我們的電話本，每個(gè)名字關(guān)聯(lián)一個(gè)電話號(hào)碼。

下面是具體的實(shí)現(xiàn)代碼，實(shí)現(xiàn)了從importthis.txt文件讀取單詞，并統(tǒng)計(jì)出現(xiàn)次數(shù)最多的5個(gè)單詞。

# -*- coding:utf-8 -*- import io import re  class Counter:     def __init__(self, path):         """         :param path: 文件路徑         """         self.mapping = dict()         with io.open(path, encoding="utf-8") as f:             data = f.read()             words = [s.lower() for s in re.findall("w+", data)]             for word in words:                 self.mapping[word] = self.mapping.get(word, 0) + 1      def most_common(self, n):         assert n > 0, "n should be large than 0"         return sorted(self.mapping.items(), key=lambda item: item[1], reverse=True)[:n]  if __name__ == '__main__':     most_common_5 = Counter("importthis.txt").most_common(5)     for item in most_common_5:         print(item)

執(zhí)行效果：

('is', 10) ('better', 8) ('than', 8) ('the', 6) ('to', 5)