PandasdrillRunning total
A pandas exercise from Pandasdrill. Solve it with a Python editor in your browser running real pandas, and it is checked the moment you submit.
The task
Return the running total of `signups`, day by day.
What this exercise teaches
cumsum returns a Series of the same length where each value is the sum so far. The last value equals the column total.
A hint if you get stuck
cumsum adds each value to the total of everything before it.
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