1. There are 2 popular Python libraries tomlkit and toml for parsing TOML formatted files in Python. tomlkit is preferred to toml as it is more flexible and style-preserving.

2. A TOML file always interpret a key (even a bare ASCII integer) as string. For this reason, a dict with numerical keys cannot be serialized using toml.

3. Indentions are allowed in a TOML file.

References

• Hands on the Python Library tomlkit

• Hands on the Python Library toml

• Adopting/recommending a toml parser?