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)更多python教程，推荐学习：Python视频教程
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