list去重的各种方法最简单的思路就是：id=[1,2,3,3,4,2,3,4,5,6,2]news_id=[]fori

最简单的思路就是：

id = [1,2,3,3,4,2,3,4,5,6,2]
news_id = []
for id in id:
if id not in news_id:
news_id.append(id)
print news_id

是用set：

id = [1,4,3,3,4,2,3,4,5,6,2]
id = list(set(id))

按照索引再次排序:

id = [1,4,3,3,4,2,3,4,5,6,2]
news_id = list(set(id))
news_id.sort(key=id.index)

使用itertools.grouby，但是列表顺序会变：

id = [1,4,3,3,4,2,3,4,5,6,2]
id.sort()
it = itertools.groupby(id)

for k, g in it:
print k

用reduce：

id = [1,4,3,3,4,2,3,4,5,6,2]
func = lambda x,y: y in x and x or x+[y]
reduce(func, [[], ] + id)

思路其实就是先把ids变为[[], 1,4,3,......] ,然后在利用reduce的特性

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