PandasdrillCount rows per group
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 number of orders each rep has, as a Series indexed by rep in alphabetical order.
What this exercise teaches
groupby("rep").size() counts the rows in each group. value_counts gives the same numbers but sorts them by count, largest first, so the order would not be alphabetical without sort_index().
A hint if you get stuck
count() or size() per group gives the number of rows. groupby sorts the keys for you.
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