PandasdrillColumns into rows with stack
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
`wide` is indexed by store with one column per quarter. Use `stack` to turn it into a Series indexed by store and quarter.
What this exercise teaches
stack pivots the columns into the index, giving one value per store and quarter. unstack does the opposite, and calling it on a DataFrame stacks the other way round, with quarter first.
A hint if you get stuck
stack moves the column labels into the innermost level of the index.
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