### Angular gridlines in sage plot

My ubuntu sage installation still has some problems. So I ~~have been able ~~installed it on my mac to ~~install it as an application in a mac though. ~~get started. I was wondering if there is some way to make non-vertical gridlines in Sage.

For example, I used

show(L,gridlines=True)

for some graphics object L. Now I want to rotate just the y axis gridline by 30 degrees. How can I do it? Thanks.