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python基礎之利用set去重

>>> List=[1,2,3,6,7,5,4,6,7,5,6,7,6,7,9,8,9,8,9,5,8,9,8,8]
>>> a=set(List)
>>> a
{1, 2, 3, 4, 5, 6, 7, 8, 9}
>>> List=list(a)
>>> List
[1, 2, 3, 4, 5, 6, 7, 8, 9]