相当于Ruby的.select的Python

Python具有内置

filter

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 *** 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))