tomllib — Parse TOML files¶

Source code: Lib/tomllib

This module provides an interface for parsing TOML 1.0.0 (Tom’s Obvious Minimal Language, https://toml.io). This module does not support writing TOML.

This module defines the following functions:

tomllib.load(fp, /, *, parse_float=float)¶

Read a TOML file. The first argument should be a readable and binary file object. Return a dict. Convert TOML types to Python using this conversion table.

parse_float will be called with the string of every TOML float to be decoded. By default, this is equivalent to float(num_str). This can be used to use another datatype or parser for TOML floats (e.g. decimal.Decimal). The callable must not return a dict or a list, else a ValueError is raised.

A TOMLDecodeError will be raised on an invalid TOML document.

tomllib.loads(s, /, *, parse_float=float)¶

Load TOML from a str object. Return a dict. Convert TOML types to Python using this conversion table. The parse_float argument has the same meaning as in load().

A TOMLDecodeError will be raised on an invalid TOML document.

The following exceptions are available:

exception tomllib.TOMLDecodeError(msg, doc, pos)¶

Subclass of ValueError with the following additional attributes:

msg¶

The unformatted error message.

doc¶

The TOML document being parsed.

pos¶

The index of doc where parsing failed.

lineno¶

The line corresponding to pos.

colno¶

The column corresponding to pos.

Changed in version 3.14: Added the msg, doc and pos parameters. Added the msg, doc, pos, lineno and colno attributes.

Deprecated since version 3.14: Passing free-form positional arguments is deprecated.

import tomllib

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

import tomllib

toml_str = """
python-version = "3.11.0"
python-implementation = "CPython"
"""

data = tomllib.loads(toml_str)