Fuzzy Matching in Excel Data Using Pandas and Python

Understanding Pandas DataFrame VLOOKUP Values Using Vectorized Operations in Python

Grouping Column Values with a Difference of 3 in Python Using Pandas

Efficient Data Analysis: Grouping by Summing Values with Large Datasets

How to Use cx_Freeze to Convert Python Scripts into Standalone Executables with Missing Dependency Error Fixes

The Fastest Way to Transform a DataFrame: Optimizing Performance with GroupBy, Vectorization, and NumPy

Extracting Values from a Column with Pandas in Python

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.

Understanding pandas.read_csv's Behavior with Leading Zeros and Floating Point Numbers: A Guide to Avoiding Unexpected Results When Working with CSV Files in Python