如果您从使用 big_list() 创建的列表创建一个 set，您可以使用它来通过迭代集合的所有元素并选择所有值 > 0 且负值也在集合中的元素来创建期望结果列表.

If you create a set from a list created with big_list(), you can use it to create a desired result list by iterating through all the elements of the set and selecting all those whose values are > 0 and whose negative value is also in the set.

您可以使用列表显示表达式，通常称为列表推导式"，用 [] 括号内的一行长代码创建结果列表，就像 big_list() 函数所做的那样.

You can use a list display expression, commonly call a "list comprehension", to create the resultant list with one long-ish line of code inside [] brackets, like the big_list() function does.

希望这会有所帮助.