df = pd.read_csv('YOUR_FILEPATH_HERE/BlackFriday.csv')
#create a pivot table
table = pd.pivot_table(df,values = 'Purchase', index=['Gender'],columns='Age',aggfunc=np.sum)

#create a pivot table with nested index
table1 = pd.pivot_table(df,values = 'Purchase', index=['Gender','City_Category'],columns='Age',aggfunc=np.mean)