python绘图-共享双轴

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python绘图共享双轴代码：柱状图+折线图

df = pd.read_excel('./1.xlsx',sheet_name = 'Sheet1')
df1 = pd.read_excel('./1.xlsx',sheet_name = 'Sheet2')

fig = plt.figure()
ax1 = fig.add_subplot(111)
#fig, ax1 = plt.subplots()

ax1 = sns.barplot(x="Year", 
            y="value", 
            hue='class',
            data=df)
ax1.set_xlabel("Year")
ax1.set_ylabel("value")

ax2 = ax1.twinx()
ax2 = ax1.twiny()

ax2.plot(df1['Year'],df1['value1'],'-rs')

plt.show()