TomlArg

A unified TOML + CLI parser for configurable Python projects. Every TOML key-value pair becomes a command-line flag with a default value.

Features

  • Drop-in replacement for argparse.ArgumentParser.
  • Flag precedence is command line, then TOML, then add_argument defaults.
  • Multiple TOML sources can be specified from file, string, or already-parsed dict.
  • TOML sources merge in the order added, where a later source overrides only the keys it names.
  • Tables are flattened into dotted flags (--db.pool.size) at any depth.
  • Arrays of tables are index-addressable (--servers.1.port, --servers.2.port).
  • Custom delimiter (ArgumentParser(delimiter="__") gives --db__pool__size).
  • Values are typed as hinted from the TOML: strings, integers, floats, booleans, datetimes, dates, times and arrays.
  • Boolean keys generate affirmative and negated flags: --debug and --no-debug.
  • Arrays take a comma-separated value (--tags a,b,c), with --tags= or a bare --tags giving an empty one.
  • --help lists TOML-derived flags alongside declared ones.
  • No dependencies beyond Python 3.12+.

Install

pip install tomlarg

Example Code

# import argparse
import tomlarg

# TOML can be given via constructor.
parser = tomlarg.ArgumentParser(toml_file="config.toml")
parser.add_argument("--port", type=int)

# Or TOML can be given via add_toml* methods.
parser.add_toml("profile.toml")
parser.add_toml_str("""
[user]
name = "User"
""")

args = parser.parse_args()
args.db.host  # from [db] host
args.servers[1].port  # from the second [[servers]]

data = dict(args)  # to plain dict

Example Usage

Simple example:

python3 examples/basic --db.host db.internal --servers.1.port 9999

Example showing multiple TOML sources:

python3 examples/layered

See examples.

Todo

  • TOML comment parser to attach argument parameters e.g. choices, required, deprecated.
  • Subparsers.

Project links

Data verified by PyPI on Aug 3, 2026
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Key dates

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  • Released:
Newer release available (0.2.1)

1 maintainer

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Avatar for tuppl from gravatar.com tuppl

Credits

Author: Dan Nguyen

GitHub Statistics

Data verified by PyPI on Aug 3, 2026
The GitHub source repository was provided by the project maintainers and verified by PyPI at the time of upload. Stars, forks, and open issues/PRs are derived from that repository and have not been independently verified.

License expression

MIT
View SPDX License List

Requires

Python >=3.12

Tags

argparse arguments cli config configuration pyproject toml

Classifiers

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