Retrieving from a multi-index in Pandas

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What is a multi-index? How do I create one, and (more importantly), how do I retrieve from one? In this video, I show you a few techniques for working with multi-indexes, including the powerful "xs" method.

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ReuvenLerner

your level of delivery of the material is one of the greatest I've seen. can't stress this enough. I'd prefer your videos over pandas documentation any day:). especially when describing edge cases, thanks

horoshuhin

You make this so much easier to understand

stevenherren

Amazing..one of the most underrated Python/Pandas content creators.

Awesome stuff Sir!

pietraderdetective

Hi Reuven! what happens if I have unique values, and I I want to know they qtys of each of them, how do I reshape in order to calculate that? by the way your Oreilly course was great!

alanhernandez

Hi Reuven!
for even more flexibility when selecting from multi-index data frames, you can use the 'get_level_values' method, for example like here:
df[
df.index.get_level_values('Year').isin([1993, 1920, 2010]) &
df.index.get_level_values('Sport').isin(['Archery', 'Judo']) &
(df.Age < 24.0)
]

TadeuszKurpiel

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