Note that tutorials/introductory/usage.py is also now wrong.

Milestoning as release critical if #10282 is going to stay in...

Failures:

/home/travis/build/matplotlib/matplotlib/lib/matplotlib/rcsetup.py:274:10: E711 comparison to None should be 'if cond is None:'
    if s == None:
         ^
/home/travis/build/matplotlib/matplotlib/lib/matplotlib/rcsetup.py:287:10: E711 comparison to None should be 'if cond is None:'
    if s == None:
         ^

Sorry - shouldn't ask for reviews before I make sure the tests pass.

@anntzer does this mean we can remove the somewhat complicated testing check? I left it in for now...

Probably the warnings suppression in matplotlib/__init__ too.

I didn't see what needs changing in __init__.py...

https://github.com/matplotlib/matplotlib/pull/10282/files#diff-9ffb0d1db51a67ee4f37528e00715b3cR1119 and https://github.com/matplotlib/matplotlib/pull/10282/files#diff-9ffb0d1db51a67ee4f37528e00715b3cR1160

I guess I wasn't saying we had to get rid of all the warning suppression. I don't quite understand what those two sections do. Feel free to push onto this PR, or open one and close thsi one.

Leaving them in is a bit redundant but not a critical problem I think.

Isn't this still happening on the Python 3.6 build? Sure is annoying when running pytest.

I’m a little confused about pytest. Does it look at the local matplotlibrc? If so, if you still have that rcParams in your matplotlibrc you’ll get the warnings.

Test setup calls rcdefaults, which re-applies all rcParams. I guess it takes the final result somehow instead of None.

Ok well we should put the test logic back then I guess. I do t quite get why this is happening though.

Won't have much time to take care of this (or other prs) in the coming days. Will get back later, but if this is blocking a release feel free to revert the original deprecation (sorry for the sloppy patch).

OK, backend.qt4 and backend.qt5 need to be added to _obsolete_set in __init__.py I think, though I'm a little confused about the differences between _obsolete_set and _deprecated_map.