Python happily will read as much as it can into a huge string, potentially using all (or most) of the memory on your computer. A better strategy, and a traditional one in Python, is to read through ...

How to read CSV files in Python by importing modules To get started, we’re first going to create our CSV file.

Circumventing the OS file IO operations will not speed anything up. Read the file in optimal chunks, keep what you need, throw the rest away. You don't need to read the whole file into memory.

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.