Creating Unique Excel Worksheets with Pandas GroupBy and Filtering

Split DataFrame Column Names Based on Dictionary Values

Understanding XlsxWriter: Writing Interactive Excel Dashboards with Python

Merging DataFrames with the Same Column Headers: A Comprehensive Guide

To calculate the sum of sales for each salesman in a month before their training date, we need to group by "salesman" and "transaction_month", then apply the aggregation function `sum` to the 'sales' column.

Importing Excel Data into PowerPoint Slides with Python: A Step-by-Step Guide

Grouping Data in Pandas: A Comprehensive Guide to Summing Elements Based on Value of Another Column

Optimizing Performance by Loading Strings as dtype('a3') from a TSV Table

Building a Custom Dictionary from a JSON File Using Python

Filtering Time Data with Pandas: A Step-by-Step Guide