25.11.17 07:33, Nick Coghlan пише:
* ``FutureWarning``: always reported by default. The intended audience is users of applications written in Python, rather than other Python developers (e.g. warning about use of a deprecated setting in a configuration file format).
Given its presence in the standard library since Python 2.3, ``FutureWarning`` would then also have a secondary use case for libraries and frameworks that support multiple Python versions: as a more reliably visible alternative to ``DeprecationWarning`` in Python 2.7 and versions of Python 3.x prior to 3.7.
I think it is worth to say more explicitly that the primary purpose of FutureWarning (warn about future behavior changes that will not be errors) is kept. It is just added a secondary purpose: a replacement for DeprecationWarning if you want to be sure that it is visible to end users. I think that showing DeprecationWarning in __main__.py is just a first step. In future we can extend the scope of showing DeprecationWarning.