4.8. Dual Axis Chart

import pandas as pd
import matplotlib.pyplot as plt

data = {'Month':['Jan','Feb','March','April'],
        'Sales': [99, 98, 95, 90],
        'Profit': [10,20,30,40]
       }
df=pd.DataFrame(data,columns=['Sales','Profit'],index=data['Month'])
df

	Sales	Profit
Jan	99	10
Feb	98	20
March	95	30
April	90	40

4.8.1. Dual Axis Line Chart

• When one column’s number is too large and other column’s number if too small

• How you create dual axis is create second axis using twin() and create plot on that axis

fig,ax=plt.subplots()
ax.plot(df.index,df['Sales'],label='Sales',color='green') 
ax.set_ylabel('Sales')

ax2=ax.twinx()
ax2.plot(df.index,df['Profit'],label='Profit')
ax2.set_ylabel('Profit')
fig.legend(['Sales','Profit'],bbox_to_anchor=(.9,.88))

<matplotlib.legend.Legend at 0x7fea640db1c0>