import pandas as pd

data 'Day': $[\text{'}$Dinner$\text{'},$ 'Lunch', 'Dinner', 'Dinner', 'Lunch'$],$

'Time': $[\text{'}$Tue$\text{'},$ 'Sun' $,$ 'Mon', 'Sun', 'Mon'$],$

'TotBill': $[17,10,21,23,24]$

Data$=$pd$.$DataFrame$($data$)$

Data.groupby$([$ 'Day', 'Time'$])[\text{'}$Time$\text{'}].$ count$()$