projection : {None, 'aitoff', 'hammer', 'lambert', 'mollweide', 'polar', 'rectilinear', str}, optional
The projection type of the subplot (Axes). str is the name of a custom projection, see projections. The default None results in a 'rectilinear' projection.
Bug report
Bug summary
The
projectionkwarg forfig.add_subplotdoes not make it clear that it can also take a subclass ofAxesas an argument (I think, its all a little unclear).