The Most Profitable PeriodsThe Most Profitable Periods

Good, now we know that the given data are weekly. Let's find out what weeks were the most profitable by comparing the total for each week.


  1. Group the observations in the df dataframe by the 'Date' column values.
  2. Select the 'Weekly_Sales' column.
  3. Calculate the total (sum) for each group.
  4. Sort values in descending order (not ascending).

Everything was clear?

Section 3. Chapter 5
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