How to Read From a File in Python: Methods, Modes, and What to Know First

Reading files is one of the most common tasks in Python — whether you're processing a CSV of sales data, parsing a log file, or loading configuration settings for a web app. Python makes this straightforward, but there are several ways to do it, and the right approach depends on your file type, size, and what you plan to do with the data.

The Core Mechanism: Opening a File

Before you can read anything, Python needs to open the file. This is done using the built-in open() function, which returns a file object you can then read from.