How do I use the MultiIndex in pandas?

One of the most powerful features in pandas is multi-level indexing (or "hierarchical indexing"), which allows you to add extra dimensions to your Series or DataFrame objects. But when should you use a MultiIndex, and how do you create, slice, and merge MultiIndexed objects?

In this video, I'll demonstrate:
- How to create a Series with a MultiIndex, and how to convert it to a DataFrame
- How to select from a Series with a MultiIndex
- How to create a DataFrame with a MultiIndex
- How to select from a DataFrame with a MultiIndex
- How to merge two DataFrames with MultiIndexes

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=== RELATED RESOURCES ===

Download the lesson notebook: http://nbviewer.jupyter.org/github/justmarkham/pandas-videos/blob/master/pandas_multiindex.ipynb

Using the pandas index (Part 1): https://www.youtube.com/watch?v=OYZNk7Z9s6I&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=17
Using the pandas index (Part 2): https://www.youtube.com/watch?v=15q-is8P_H4&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=18
Analyzing groups with groupby: https://www.youtube.com/watch?v=qy0fDqoMJx8&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=14
Selection and slicing with loc: https://www.youtube.com/watch?v=xvpNA7bC8cs&list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y&index=19
My full pandas video series: https://www.youtube.com/playlist?list=PL5-da3qGB5ICCsgW1MxlZ0Hq8LL5U3u9y

DataCamp course on MultiIndex: https://www.datacamp.com/courses/manipulating-dataframes-with-pandas?tap_a=5644-dce66f&tap_s=280411-a25fc8
DataCamp course on merging: https://www.datacamp.com/courses/merging-dataframes-with-pandas?tap_a=5644-dce66f&tap_s=280411-a25fc8

Tidy data: http://r4ds.had.co.nz/tidy-data.html
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Видео How do I use the MultiIndex in pandas? канала Data School