Set Difference in Data Analysis: Methods for Identifying Unique Elements

Here's a refactored version of the code with proper indentation, comments, and a clear structure:

Replacing Countries with 'Other' in a Pandas DataFrame

Manipulating MultiIndex DataFrames in Pandas: Advanced Techniques

Simulating Pandas `removeDuplicates()` in Google BigQuery SQL Using GROUP BY and FIRST() Functions

Finding the Difference Between Two Rows Over Specific Columns in Pandas DataFrames

Finding Indices of Rows Containing NaN in a Pandas DataFrame

Retain Narrative Text at Specific Row Indices Across Multiple Excel Sheets Using Python and pandas.

Extracting First and Last Working Days of the Month from a Time Series DataFrame: A Step-by-Step Guide to Creating Essential Columns in Pandas

Plotting Column Data Points With Multiple Values Per Cell Using Matplotlib and Plotly