Run the following code to load NumPy, and pandas, and to initialize a DataFrame object:

import numpy as np
import pandas as pd
df1 = pd.DataFrame([['Pen', 24, 2.39],
                    ['Eraser', 32, 1.29],
                    ['Sharpener', 12, 10.39],
                    ['Pencil', 42, 0.59 ]],
                   index=[100024, 201024, 202034, 101122],
                   columns = ['item', 'inventory', 'unit_price'])