Bug report

Bug summary

Callingadd_axes without args is deprecated. However, if a kwarg is passed, the deprecation warning still shows.

Code for reproduction

importmatplotlib.pyplotaspltfig=plt.figure()ax=fig.add_axes(rect=[0,0,1,1])

Actual outcome

<ipython-input-128-1ef4234f1c1f>:3: MatplotlibDeprecationWarning: Calling add_axes() without argument is deprecated. You may want to use add_subplot() instead.  ax = fig.add_axes(rect=[0, 0, 1, 1])

Expected outcome

No warning should be shown.

Discussion

figure.add_axes currently starts with

        if not len(args):            cbook.warn_deprecated(                "3.3",                message="Calling add_axes() without argument is "                "deprecated. You may want to use add_subplot() "                "instead.")            return

Because the function forwardskwargs, the intended behavior is a bit ambiguous to me, but I'm assuming from the docstring that the intention is to force the user to passrect specifically?

if not len(args) and 'rect' not in kwargs:    ...

I can make this a PR if necessary, but if I'm not sure if we continue to update 3.2...And I don't know what the deprecation schedule even looks like for removing the "ability to use no args", so I don't know if this will even be an issue after 3.3....just wanted to point it out.

Feel free to close if this is a non-issue.