Python list如何去重

ids = [1,2,3,3,4,2,3,4,5,6,1]

news_ids = []

for id in ids:

    if id not in news_ids:

        news_ids.append(id)

print news_ids

ids = [1,4,3,3,4,2,3,4,5,6,1]

ids = list(set(ids))

ids = [1,4,3,3,4,2,3,4,5,6,1]

news_ids = list(set(ids))

news_ids.sort(key=ids.index)

ids = [1,4,3,3,4,2,3,4,5,6,1]

ids.sort()

it = itertools.groupby(ids)

for k, g in it:

    print k

In [5]: ids = [1,4,3,3,4,2,3,4,5,6,1]

In [6]: func = lambda x,y:x if y in x else x + [y]

In [7]: reduce(func, [[], ] + ids)

Out[7]: [1, 4, 3, 2, 5, 6]