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>>> timeit.timeit('[i for i in [1,2,3,None,4,None] if i]')
0.25813157798256725
>>> timeit.timeit('list(filter(lambda x: x, [1,2,3,None,4,None]))')
0.6017552959965542
>>> timeit.timeit('filter(lambda x: x, [1,2,3,None,4,None])')
0.1967865889891982
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