[Python-Dev] Deprecation warnings in Python 2.7 (original) (raw)

Raymond Hettinger raymond.hettinger at gmail.com
Wed Mar 3 02:28:11 CET 2010

On Tue, Mar 2, 2010 at 15:55, Florent Xicluna <florent.xicluna at gmail.com> wrote: Hello, I would like to open a discussion on the meaning of deprecation warnings in 2.7. I assume, but I may be wrong, that 2.7 will be the last version in the 2.x branch. With this assumption, we should not find many things deprecated in 2.7 final. On the other hand, the list of py3k deprecation warnings is increasing a lot. And more users will probably start to move from 2.7 to the 3.1 release. While working on ticket #7092 and #7849, we started to discuss some proposals to simplify the deprecation warnings for 2.7. We discussed these 2 proposals: 1) in 2.6 there's no distinction between py3k and normal deprecations: they share the same category, DeprecationWarning. The "-3" switch enables the py3k DeprecationWarning and SyntaxWarning. Do we need to introduce a subclass Py3kDeprecationWarning in 2.7? It will make it easier to separate both kinds of deprecations (2.x and 3.x), and to filter them. 2) a different idea is to deprecate the "-3" switch and consider all py3k deprecations as normal deprecations.

-1 for several reasons.

  1. We've advertised -3 as part of TheOneTrueWay(tm). It's a core part of our transition story, so we should keep that as clean/consistent as possible. Deprecating the -3 switch seems like shooting ourselves in the foot.

  2. There is some chance that there will be a 2.8, so it isn't helpful to burn down our bridges.

ISTM, nothing is currently broken and in need of "fixing" in 2.7. I don't see any advantage to conflating py3k warnings with other deprecations.

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