python - 列表是另一个列表的子集

Question

在 Python 中，给定两个对列表:

listA = [ [1,20], [3,19], [37,11], [21,17] ]
listB = [ [1,20], [21,17] ]

如果 listB 是 listA 的子集，你如何有效地编写一个返回 True 的 python 函数？哦，[1,20] 对等同于 [20,1]

Answer 1

使用frozenset。

>>> listA = [ [1,20], [3,19], [37,11], [21,17] ]
>>> listB = [ [1,20], [21,17] ]

>>> setA = frozenset([frozenset(element) for element in listA])
>>> setB = frozenset([frozenset(element) for element in listB])

>>> setA
frozenset([frozenset([17, 21]), frozenset([1, 20]), frozenset([11, 37]), frozens
et([19, 3])])
>>> setB
frozenset([frozenset([17, 21]), frozenset([1, 20])])

>>> setB <= setA
True