python去重

去重

a=[1,2,4,2,4,5,6,5,7,8,9,0]

<1> a=[1,2,4,2,4,5,6,5,7,8,9,0]
a2=set(a)
print(a2)

<2> a=[1,2,4,2,4,5,6,5,7,8,9,0]
#用list类的sort方法
#保持他们原来的排序：
a2 = list(set(a))
a2.sort(key=a.index)
print(a2)