Here's an example code that demonstrates how to use the `groupby` and `agg` functions together:

Understanding the Problem: Updating a Value in a Pandas DataFrame Based on Multiple Conditions

Adding a New Column with Dictionary Values in Pandas: A Step-by-Step Guide

Working with Nulls in Pandas DataFrames: Preserving Data Integrity

List Comprehension for Efficient Data Manipulation in Pandas Series and DataFrames

Conditional Column Modification in Pandas DataFrames: A Practical Guide to Increasing Values Based on Conditions

Understanding Dataframe Columns and String Splitting in Pandas: How to Avoid Losing Information During String Splitting

Understanding Pandas DataFrame Shape and Indexing Mistakes

Comparing Data Frames in R: A Comprehensive Guide to Vectorized Operations, Regular Expressions, and dplyr Package

Understanding the Basics of Pandas DataFrame Joining: A Comprehensive Guide