[Twisted-Python] [RFC] Deprecation Policy

[David Ripton]

On 2008.04.18 15:06:10 +1000, Jonathan Lange wrote:
> CompatibilityPolicy suggests release-based deprecation that is graded
> over 4 releases: release N PendingDeprecationWarning, N+1
> DeprecationWarning, N+2 DeprecationError, N+3 remove the
> functionality.
> 
> Ticket #1216 suggests a release-based deprecation policy that is not
> graded and over 1 release: release N, add DeprecationWarning, release
> N+1, remove the functionality.

As a user, I don't see much difference between a
PendingDeprecationWarning and a DeprecationWarning.  Or between a
DeprecationError and the code being removed.  Simple is good.

> Now, here's what I think.
> 
> * Release-based, not time-based.

Now that version numbers are based on the year, there's not a big
difference.  For example, if you wanted to guarantee at least a year of
DeprecationWarning before removing a feature, you could implement that
by saying that if the warning goes in in 8.x, then the feature can come
out in 10.0.  Or vice-versa.

-- 
David Ripton    dripton at ripton.net