This post will show you how to open CSV files in Python using the CSV module. You'll also learn another method + how to write CSV files!

The problem I've noticed is that if I append the file with each of the 100k runs (one at a time), it can happen that two threads try to save to the file at the same time and some row (s) end up empty.

What makes a CSV file unique is the way its content is organized. Here's what you need to know about CSV files and how to use them.