Running Totals and Differences
np.cumsum gives a running total; np.cumprod a running product. np.diff gives the change from each value to the next (one fewer value than you started with). Together they answer questions such as "how much did we save so far?" and "how much did it change each month?".
Examplepython
Quick check
What does `np.diff([5, 8, 6])` give?
Your turn: write the code
Print the running total of the daily sales.
Finish the quick check (and any code exercise) to complete this lesson, or mark it done yourself.
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