如何在Python中创建迭代器管道？ [英] How to create an iterator pipeline in Python?

问题描述

是否有用于在Python中创建迭代器管道的库或推荐方法？

Is there a library or recommended way for creating an iterator pipeline in Python?

例如：

>>>all_items().get("created_by").location().surrounding_cities()

我还希望能够访问迭代器中对象的属性。在上面的示例中， all_items（）返回项的迭代器，并且项具有不同的创建者。

I also want to be able to access attributes of the objects in the iterators. In the above example, all_items() returns an iterator of items, and the items have different creators.

.get（created_by）然后返回项目的created_by属性（这是人物），然后 location（）返回每个人的城市，然后将其传送到 surrounding_cities（），其中返回每个位置的周围城市的所有迭代器（因此最终结果是周围城市的大型列表）。

The .get("created_by") then returns the "created_by" attribute of the items (which are people), and then location() returns the city of each person, and then pipes it to surrounding_cities(), which returns all an iterator of the surrounding cities for each location (so the end result is a large list of surrounding cities).

推荐答案

你不只是在处理迭代器吗？在Python中使用迭代器的自然方法是for循环：

Aren't you just processing an iterator? The natural way to use an iterator in Python is the for loop:

for item in all_items():
    item.get("created_by").location().surrounding_cities()

还有其他可能性如根据你正在做的事情可能更有意义的列表理解（如果你试图生成一个列表作为你的输出，通常会更有意义。）

There are other possibilities such as list comprehensions which may make more sense depending upon what you're doing (usually makes more sense if you're trying to generate a list as your output).

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