Julia の PyPlot で、seaborn の color_palette で、Y軸が左右に2軸のクラフを描く

using PyCall, PyPlot
@pyimport seaborn as sns

x = linspace(0,2pi,100)

ax1 = plot(x,sin(x),  label="sin(x)")
ylabel("sin(x)", color=sns.color_palette()[1])
plt[:legend]()

twinx()

ax2 = plot(x,2cos(x) , color=sns.color_palette()[2], label="2cos(x)")
ylabel("2cos(x)",  color=sns.color_palette()[2])
plt[:legend]()