PandasdrillClassify with apply
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
Write a function that labels an order "small" when qty is under 5, "medium" from 5 to 19, and "large" at 20 or more. Apply it to the `qty` column and return the labels as a Series.
What this exercise teaches
Series.apply calls your function once per value and collects the results in a new Series with the same index. Watch the boundaries: 5 is medium and 20 is large.
A hint if you get stuck
Define a plain Python function that takes one number and returns a string, then pass the function itself (no parentheses) to apply.
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