Python之list

去重

li = {}.fromkeys(list).keys()
li = list(set(list))

求和

li = sum(x for x in list)

求奇数项

li =list[::2]

求偶数项

li = list[1::2]

升序排列

li = sorted(list)

li = list.sort()

降序排列

li =sorted(list,reverse=True)