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[英]Python: Join each element different lists of lists in one list of lists
[英]Python: Join lists of lists by the first element
我正在尝试通过列表中的第一个元素组合列表/元组列表-像这样:
输入:
[(1, [32, 432, 54]), (1, [43, 54, 65]), (2, [2, 43, 54]), (2, [1, 5, 6])]
输出:
[(1, [32, 432, 54], [43, 54, 65]), (2, [2, 43, 54], [1, 5, 6])]
列表实际上是按第一个元素排序的,就像在我的示例输入中一样,并且最后元组是否是列表也没有关系。
有没有一种有效的/ python方式来做到这一点?
使用itertools.groupby
和list comprehension :
>>> lst = [(1, [32, 432, 54]), (1, [43, 54, 65]), (2, [2, 43, 54]), (2, [1, 5, 6])]
>>> import itertools
>>> [(key,) + tuple(v for k, v in grp)
... for key, grp in itertools.groupby(lst, key=lambda x: x[0])]
[(1, [32, 432, 54], [43, 54, 65]), (2, [2, 43, 54], [1, 5, 6])]
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