December 2018
Beginner to intermediate
682 pages
18h 1m
English
Content preview from Numerical Computing with Python
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
Start your free trial
Customizing an aggregation function
Pandas provides a number of the most common aggregation functions for you to use with the groupby object. At some point, you will need to write your own customized user-defined functions that don't exist in pandas or NumPy.