python - Add polar axes to cartesian plot in Matplotlib -


i have drawn polar contour plot in matplotlib described in this question. works converting polar co-ordinates cartesian co-ordinates , plotting in cartesian co-ordinate system.

however, want able have set of polar co-ordinate system axes overlain on plot - is, radial axes (sticking out centre) @ 0, 90, 180 , 270 degrees, ticks on them showing radius @ various points.

i have absolutely no idea how go doing this, , can't seem find in documentation. suggestions?


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