>>>L = [4,3,5,3,2,5]
>>>temp = list(set(L))
>>>print temp
[2,3,4,5]
>>>temp.sort(key = L.index)
>>>print temp
[4,3,5,2]

>>>temp = []
>>>for i in L:
>>>    if i not in temp:
>>>        L.append(i)

>>>L = {‘abc‘, ‘ABD‘, ‘aBe‘}
>>>L.sort()
>>>L
[‘ABD‘, ‘aBe‘, ‘abc‘]
>>>L.sort(key=str.lower,reverse=True)
>>>L
[‘aBe‘,‘ABD‘,‘abc‘]

列表迭代与解析