Group By Column Data

import matplotlib.pyplot as plt
import pandas as pd

employees = pd.DataFrame({
    'EmpCode': ['Emp001', 'Emp002', 'Emp003', 'Emp004', 'Emp005', 'Emp006'
                , 'Emp007', 'Emp008', 'Emp009', 'Emp010', 'Emp011', 'Emp012'
                , 'Emp013', 'Emp014', 'Emp015', 'Emp016', 'Emp017', 'Emp018'
                , 'Emp019', 'Emp020'],
    'Occupation': ['Chemist', 'Statistician', 'Statistician', 'Statistician',
                   'Programmer', 'Chemist', 'Statistician', 'Statistician',
                   'Statistician', 'Programmer', 'Chemist', 'Statistician',
                   'Statistician', 'Statistician', 'Programmer', 'Chemist',
                   'Statistician', 'Statistician', 'Statistician', 'Programmer'
                   ],
    'Age': [23, 24, 34, 29, 40, 25, 26, 29, 40, 41, 40, 35, 41, 29, 33, 35,
            29, 30, 36, 37]})

employees.boxplot(column=['Age'], by=['Occupation'])

plt.show()