The filter function calls a test function, which returns a Boolean, on each element of a list and includes that element only if the test function returns True.

filter函数为列表的每个元素调用一个测试函数，测试函数返回布尔值，当测试函数返回True时，还包含列表的元素。

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The filter function calls a test function, which returns a Boolean, on each element of a list and includes that element only if the test function returns True.

filter函数为列表的每个元素调用一个测试函数，测试函数返回布尔值，当测试函数返回True时，还包含列表的元素。

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