python计算单词出现次数_python统计单词出现次数

python统计单词出现次数

做单词词频统计，用字典无疑是最合适的数据类型，单词作为字典的key， 单词出现的次数作为字典的 value，很方便地就记录好了每个单词的频率，字典很像我们的电话本，每个名字关联一个电话号码。

下面是具体的实现代码，实现了从importthis.txt文件读取单词，并统计出现次数最多的5个单词。# -*- coding:utf-8 -*-

import io

import re

class Counter:

def __init__(self, path):

"""

:param path: 文件路径

"""

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)

执行效果：('is', 10)

('better', 8)

('than', 8)

('the', 6)

('to', 5)

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