容器是否总是可迭代的？ [英] Are containers always iterable?

问题描述

根据该图，是否存在容器不可迭代的情况？

Is there a scenario where the container is not iterable, according to this graph?

推荐答案

取决于您总是的意思。根据 collections.abc

Depends on what you mean by always. According to collections.abc

• 一个容器是实现 __ contains __ 方法的对象


• 可迭代的对象是实现 __ iter __ （或 __ getitem __ ，作为后备）



• a container is an object that implements __contains__ method
• an iterable is an object that implements __iter__ (or __getitem__, as a fallback)

因此，从理论上讲，没有，您可以实现一个不可迭代的容器。但是，所有标准python容器（以及大多数由库实现的容器）也是可迭代的。

So, theoretically, no, you can implement a container that is not an iterable. However, all standard python containers (and most containers implemented by libraries) are also iterable.

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