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Overview

用來篩選一個可迭帶物件，回傳符合運算式的元素。

Usage

語法：filter(function, iterable)

a = [1, 2, 3, 4, 5]
even = filter(lambda x: x % 2 == 0, a)  # <filter object at 0x000001833AA71B88>
print(list(even))  # [2, 4]