Understanding Multi-Index DataFrames and Adding Columns with NaN Values

Merging Multi-Indexed Columns DataFrames in Python Using Pandas

Filling Gaps in DataFrame MultiIndex Level 1 Using Pandas GroupBy

Selecting Sub-DataFrames According to First Two Levels of Multi-Index in Pandas DataFrame

Grouping Multiple Columns with MultiIndex in Pandas Using Different Approaches

Combining Pandas Index Columns in a Method Chain Without Breaking Out of the Chain

Splitting a DataFrame Column into Two and Creating MultiIndex with Pandas

Determining Multiple Values in a Cell and Counting Occurrences

Working with MultiIndex DataFrames in pandas: Navigating the Challenges of CSV Readings and NaN Values