corgy

Elegant command line parsing for Python.

Corgy allows you to create a command line interface in Python, without worrying about boilerplate code. This results in cleaner, more modular code.

from corgy import Corgy

class ArgGroup(Corgy):
    arg1: Annotated[Optional[int], "optional number"]
    arg2: Annotated[bool, "a boolean"]

class MyArgs(Corgy):
    arg1: Annotated[int, "a number"] = 1
    arg2: Annotated[Sequence[float], "at least one float"]
    grp1: Annotated[ArgGroup, "group 1"]

args = MyArgs.parse_from_cmdline()

Compare this to the equivalent code which uses argparse:

from argparse import ArgumentParser, BooleanOptionalAction

parser = ArgumentParser()
parser.add_argument("--arg1", type=int, help="a number", default=1)
parser.add_argument("--arg2", type=float, nargs="+", help="at least one float", required=True)

grp_parser = parser.add_argument_group("group 1")
grp_parser.add_argument("--grp1:arg1", type=int, help="optional number")
grp_parser.add_argument("--grp1:arg2", help="a boolean", action=BooleanOptionalAction)

args = parser.parse_args()

Corgy also provides support for more informative help messages from argparse, and colorized output:

Install

corgy is available on PyPI, and can be installed with pip:

pip install corgy

The full corgy package requires Python 3.9 or higher. Python 3.7 and 3.8 are also supported, but only have access to CorgyHelpFormatter, and corgy.types.

Support for colorized output requires the crayons package, also available on PyPI. You can pull it as a dependency for corgy by installing with the colors extra: