3. Use tomllib for reading TOML

Use the standard-library tomllib module for read-only TOML parsing.

Using the standard library removes an extra dependency for a very common configuration format and makes the parsing expectations obvious to readers. It is a strong default when you only need to read TOML, which is the common case for files like pyproject.toml.

Note

Python 3.11+

3.1. Don’t do this

import toml

with open('pyproject.toml', 'rb') as f:
    data = toml.load(f)

3.2. Do this

import tomllib

with open('pyproject.toml', 'rb') as f:
    data = tomllib.load(f)