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HoweChen/bidirection.py

Created March 14, 2019 08:52
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[一个for循环实现双向遍历]一个for循环实现双向遍历 #Python
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bidirection.py
from itertools import chain # 这里要用itertool里的chain
# 因为在python2里 range() 返回list
# python3 里range 返回iterator，不能直接相加，要用chain方法
for i in chain(range(n), range(n)[::-1]): # 这个写法可以实现一个for里双向遍历
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