from sympy import *
from spb import *
import k3d
var("x:z")
plot_vector(Matrix([z, -x, y]), (x, -3, 3), (y, -3, 3), (z, -3, 3),
    backend=KB, n=40, streamlines=True,
    stream_kw=dict(
        starts=True,
        npoints=400,
        width=0.025,
        color_map=k3d.colormaps.matplotlib_color_maps.viridis
    ),
    xlabel="x", ylabel="y", zlabel="z")