lst = [1, 2, 3, 4, 5, 6]
filtered = filter(lambda x: x < 5, lst)
但是列表理解可能会更好，尤其是与地图操作结合使用时：
mapped_and_filtered = [x*2 for x in lst if x < 5]
# compare to:
mapped_and_filtered = map(lambda y: y*2, filter(lambda x: x < 5, lst))
相当于Ruby的.select的Python
相当于Ruby的.select的Python
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