Report week-over-week growth in orders

Question

The weekly business review needs order growth versus the previous week.

Write `wow_growth(df)` that resamples the daily `orders` column into weekly totals (weeks ending Sunday) and returns a Series of the percentage change versus the previous week, rounded to 1 decimal. The first week has no prior

Accepted Answer

Step 1: `resample('W-SUN')` buckets by week ending Sunday — the anchor matters, because a Monday-anchored week produces different numbers from the same data. Step 2: `pct_change()` divides each week by the previous one and subtracts 1, so multiplying by 100 gives a percentage. Step 3: The first week has no predecessor and is `NaN`; `fillna(0.0)` makes the series safe to chart without a gap. Step 4: Rounding at the end keeps the arithmetic exact until the moment of display.

Report week-over-week growth in orders

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