[Kwant] High symmetry band structure calculation

Dear all Is there an easy way to produce band structure plot over certain high symmetry point in brillouin zone? In order to calculate the bandstructure of certain lattice, graphene for example, One has to define a lead with periodicity in both a and b direction.

ge=kwant.lattice.general([(1.0,0),(sin_30,cos_30)], [(0,0),(0,1.0/sqrt(3))]) lead=kwant.TranslationalSymmetry(ge.vec((-1,0)),ge.vec((0,1)))

But the kwant doesn't allows me to finalize the system. Did I made a mistake or kwant currently doesn't support the brillouin zone bandstructure calculation Thanks for advance. Best regards, Liming