实况出图多个Y轴

lixiliang2008

ax1 = axes(position=[0.13,0.15,0.7,0.7])
xaxis(tickfontsize=18)
yaxis(ax1, color='k',tickfontsize=18)
fn = "F:/shikuang.csv"
df = DataFrame.read_table(fn, delimiter=',', format='%f%i%f')
x = array(df.index.data)   #行值
y = df.values[0]   #列值
n = len(y)
ind = arange(n)
bar(ind, y, width = 0.2, label='Men')
xlabel('Time/h',fontsize=20)
xticks([0, 5, 10, 15, 20, 25, 30, 35, 40],[1720, 1801, 1806, 1811, 1816, 1821, 1902, 1907, 1912])
xlim(0,41)
ylabel('Precipitation/mm', color='k',fontsize=20)

ax2 = twinx(ax1)
yaxis(ax2, color='g',tickfontsize=18)
z = df.values[1]   #列值
line1 = plot(x, z, 'g-', linewidth=2, label="RH")
ylim(60,100)
ylabel('RH', color='g', fontsize=20)

ax3 = twinx(ax1)
yaxis(ax3, shift=70, color='b', tickfontsize=18)
k = df.values[2]
line2 = plot(x, k, 'b-', linewidth=2, label="PWV")
ylabel('PWV', color='b', fontsize=20)
lines = [line1, line2]
legend(lines)