To work with csv and xlsx files the easiest package is the pandas package because it has the functionality to edit and subset the data along with writing the edited data back to a csv or excel file.

How to read CSV files in Python by importing modules To get started, we’re first going to create our CSV file. You can do this in Excel by creating a simple spreadsheet and then choosing to save ...

This post explains how to write to a file in Python. You'll discover how to create word files (.docx), spreadsheets (.csv), text files, and more!