Python:为什么我应该使用next()而不是obj.next()? [英] Python: Why should I use next() and not obj.next()?

问题描述

Python 2.6引入了next函数.

Python 2.6 introduced a next function.

为什么这是必要的?总是可以键入obj.next()而不是next(obj).

Why was this necessary? One could always type obj.next() instead of next(obj).

后者是否更多pythonic?

推荐答案

PEP 3114 对此进行了描述改变.动机摘录:

PEP 3114 describes this change. An excerpt about the motivation:

此PEP建议将next方法重命名为__next__， 与Python中所有其他协议保持一致，其中方法是 作为语言级协议的一部分被隐式调用，并且 引入名为next的内置函数来调用__next__方法， 与其他协议的显式方式一致 调用.

This PEP proposes that the next method be renamed to __next__, consistent with all the other protocols in Python in which a method is implicitly called as part of a language-level protocol, and that a built-in function named next be introduced to invoke __next__ method, consistent with the manner in which other protocols are explicitly invoked.

请务必阅读此PEP，以获取更多有趣的细节.

Be sure to read this PEP for more interesting details.

关于您为什么要使用内置的next的原因:一个很好的原因是next方法在Python 3中消失了，因此对于可移植性，最好开始使用next尽快内置.

As for why you want to use the next built-in: one good reason is that the next method disappears in Python 3, so for portability it's better to start using the next built-in as soon as possible.

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