重塑python中的不规则列表 [英] reshape an irregular list in python

问题描述

我想重塑以下列表:

wide_list = [[1,['a','b','c']],[2,['d','e']],[3,'f']]

长格式":

long_list = [[1,'a'],[1,'b'],[1,'c'],[2,'d'],[2,'e'],[3,'f']]

如何在Python中有效地实现这一目标?

How can this be achieved efficiently in Python?

推荐答案

尝试嵌套列表理解:

>>> wide_list = [[1,['a','b','c']],[2,['d','e']],[3, ['f']]]
>>> long_list = [[k, v] for k, sublist in wide_list for v in sublist]
>>> long_list
[[1, 'a'], [1, 'b'], [1, 'c'], [2, 'd'], [2, 'e'], [3, 'f']]

请注意，最后一组必须更改为匹配前两组的模式.代替 [3，'f'] ，而使用 [3，['f']] .否则，对于不遵循该模式的组，您将需要特殊情况逻辑.

Note, the last group had to be changed to match the pattern of the first two groups. Instead of [3, 'f'], use [3, ['f']] instead. Otherwise, you'll need special case logic for groups that don't follow the pattern.

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