def set_partner(self, u, value, vals=None):
assert (type(value) == int)
assert (value < G.get_number_of_vertices(self))
if vals is None:
G.set_vertex_property(self, "partner", u, value)
else:
G.set_vertex_property(self, "partner", 0, 0, vals=vals)
def __check_id(self, u):
assert (type(u) == int)
assert (u < G.get_number_of_vertices(self))
assert (u >= 0)
