Counting Y Values for Each X Value in MultiIndex DataFrames Using Pandas GroupBy and Transform

How to Collapse Rows in a Pandas Multi-Index DataFrame

Mastering Pandas Multi-Index Columns: Inverting Levels and Handling Missing Values

Partial Indexing in Pandas MultiIndex: Slicing for Easy Data Filtering

Combining Multi-Index Data Frames on Certain Index Levels in Pandas

Reindexing Pandas DataFrame MultiIndex while Maintaining Structure

Finding the Pair of Index Levels with Fewest Number of Entries in MultiIndex DataFrames using Pandas

Merging DataFrames by MultiIndex in Pandas: A Comprehensive Guide