大多数pythonic方式获得前一个元素 [英] Most pythonic way to get the previous element

问题描述

我希望在迭代器上有一个枚举 -like函数，它产生对（previous_element，current_element）。也就是说，假设 iter 是

I would like an enumerate-like functional on iterators which yields the pair (previous_element, current_element). That is, given that iter is

i0, i1, i1, ...

我想要抵消（iter）收益

(None, i0), (i0, i1), (i1, i2) ...

推荐答案

简单（明显）解决方案怎么样？

What about the simple (obvious) solution?

def offset(iterable):
    prev = None
    for elem in iterable:
        yield prev, elem
        prev = elem

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