使用__future__还是将来编写与python2和python3兼容的代码是否更可取？ [英] Is it preferable to use __future__ or future to write code compatible with python2 and python3?

问题描述

或者在某些特定情况下，一个比另一个更好？

Or are there specific situations where one is better than the other?

到目前为止，我收集到的所有信息是，将来仅适用于> = 2.6或> = 3.3。

So far, all I gathered is that future is only available for >=2.6 or >=3.3.

我拥有的当前代码非常基本，并且在python2和3上运行相同，除了使用print函数调用。但是，随着时间的推移，代码可能会变得更加复杂，我想从一开始就使用正确的方法来编写python2 / 3兼容代码。

The current code I have is very basic and runs the same on python2 and 3 except for the use of print function calls. However, the code may get more complex over time and I would like to use the right approach for writing python2/3 compatible code from the beginning.

推荐答案

__ future __ 模块是Python内置的模块，用于允许程序员提前使用尚未被视为完整的功能集。尽管提供了某些功能（例如 eg ，__ future__ import print_function 中的）专门用于将Python 2程序移植到Python 3中，

The __future__ module is built-in to Python, and is provided to allow programmers to make advance use of feature sets which are not yet regarded as complete. Although some of the features (e.g., from __future__ import print_function) are provided specifically to assist with porting Python 2 programs to Python 3, it is also used to give early access to advance features of any release.

__ future __ 是唯一的，因为某些导入例如 print_function 实际上可以更改解释器接受的语法。

__future__ is unique, in that some imports such as the print_function can actually change the syntax accepted by the interpreter.

python-future 是第三方模块，是提供兼容性功能的几个模块之一。您也可以看看 6 ，虽然现在已经有些长了，但 python-modernize 。您很有可能会发现同时需要使用 __ future __ 和 future 。

python-future is a third-party module, one of several to provide compatibility features. You could also take a look at six, though it's now somewhat long in the tooth, and python-modernize. It's quite likely you will find that you need to use both __future__ and future together.

您可能尚未考虑的另一种策略是将源转换为Python 2，该工具可以由 2to3 实用程序自动翻译。还有一个 lib3to2 会以其他方式转换，尽管我没有经验。

Another strategy you may not have considered is to convert your source to Python 2 that can be translated automatically by the 2to3 utility. There is also a lib3to2 that will translate the other way, though I have no experience with it.

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