python의 list comprehension 사용

In [1]: timeit import timeit

In [2]: def f1(seq):
   ...:    return list(filter(lambda x: x, seq))

In [3]: def f2(seq):
   ...:    return [i for i in seq if i is not None]

In [4]: timeit(stmt="f1(range(100))", setup="from __main__ import f1,f2")
6.67694592476

In [5]: timeit(stmt="f2(range(100))", setup="from __main__ import f1,f2")
4.96091508865