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collections.py
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36 lines (29 loc) · 993 Bytes
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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
"""
Topic:
collections中几个有用的数据结构
deque: 高效的双端队列
defaultdict: 类似dict，对于缺少key处理更优雅
namedtuple: 命名tuple
"""
from collections import deque
from collections import defaultdict
from collections import namedtuple
__author__ = 'Xiong Neng'
def main():
s = "yeah but no but yeah but no test good"
words = s.split()
# key不存在时调用list()函数，并保存为key对应的value
word_locs = defaultdict(list)
for n, w in enumerate(words):
word_locs[w].append(n)
print(word_locs)
# 如果定义仅用作数据结构的对象，最好使用命名tuple，无需定义一个类
network_address = namedtuple('network', ['hostname', 'port'])
a = network_address('www.python.org', 80)
print(a.hostname, a.port, sep='-')
print(type(a)) # <class '__main__.network'>
pass
if __name__ == '__main__':
main()