In the past I have used .ini files for Python config, while an older format it is easy to understand and has std-lib support with configparser. Since starting with Jekyll I have gotten used to working with ymal files. My pdf reading project needed a config file so I started to use ymal. But while looking for yaml on python docs I ran across several threads about yaml vs toml.

Reading through them changed my mind about using yaml. Reasons important to me to choose Toml:

• Default config format for Rust-Cargo
• Default config format for Pipenv
• Similar structure to .ini
• Clear way to nest tables
• More strongly typed than yaml
• Younger than yaml or JSON

Resources

Reddit - Yaml vs Toml

Toml Style Guide

Hugo - Toml vs JSON vs Yaml