Re: [matplotlib-devel] DeprecationWarnings in matplotlib effectively invisible (with proposed fix)

[Nathaniel S. <nj...@po...>]

On Wed, Dec 5, 2012 at 9:45 PM, Paul Ivanov <piv...@gm...> wrote:
> Hey everyone,
>
> In adding a deprecation warning in this pull request [1], Damon and I
> learned that DeprecationWarnings are ignored by default in Python 2.7
>
> This is rather unfortunate, and I outlined possible workarounds that I
> see in a commend on that PR [2].
>
> In trying to rectify this situation, I have created a
> MatplotlibDeperecationWarning class that inherits from UserWarning,
> which is *not* ignored by default. [3]
>
> 1. https://github.com/matplotlib/matplotlib/pull/1535
> 2. https://github.com/matplotlib/matplotlib/pull/1535#issuecomment-11061572
> 3. https://github.com/matplotlib/matplotlib/pull/1565

If you're defining your own warning class, you might consider using
FutureWarning instead of UserWarning.

We had a discussion about this issue for numpy recently:
  http://mail.scipy.org/pipermail/numpy-discussion/2012-May/062460.html
What we eventually ended up with:
  http://mail.scipy.org/pipermail/numpy-discussion/2012-May/062468.html

-n