[ENH]: Add get_xmargin, get_ymargin, get_zmargin axes methods

[anntzer]

Problem

Currently, I think the only public API to retrieve the margins settings on an Axes is ax.margins(), which has a somewhat peculiar API (basically inherited from pyplot/matlab); adding get_xmargin/get_ymargin/get_zmargin Axes methods would be nice (there's already the corresponding setters).

Bonus points for moving the private _xmargin/_ymargin/_zmargin to the Axis instances, adding Axis.{get,set}_margin, and using axis_method_wrapper, though I haven't checked it'll actually work.

Proposed solution

No response

[turnipseason]

Hi!
Does zmargin exist? I couldn't find it -- both the public docs and the code in _base.py only have xmargin and ymargin. Am I missing something?

[oscargus]

It is in Axes3D.