Skip to main content
Join the official 2019 Python Developers SurveyStart the survey!

Arguments parsing without boilerplate.

Project description


PyPI version Downloads Build Status Coverage Docs

GitHub | PyPI | Docs | Examples | Installation | Changelog

Arguments parsing without boilerplate.


  • arguments and type hints in IDE
  • easy nested sub-commands
  • sane defaults for arguments' params (ie if default of arg is 3 then type should be int, or when annotation/type/default is bool then generate 2 arguments: for true value --arg and for false --no-arg, ...)
  • 𝕡𝕣𝕖𝕥𝕥𝕪 𝕡𝕣𝕚𝕟𝕥𝕚𝕟𝕘
  • support for argparse actions
  • common options/arguments reusability
  • auto shortcuts generation: --verbose -> -v, --foo_bar -> --fb
  • auto completion in shell (tnx to argcomplete)


pip install argser
pip install argser[tabulate]  # for fancy tables support
pip install argser[argcomplete]  # for shell auto completion
pip install argser[all]

Notes for examples

If second parameter of parse_args is string (as in almost all examples) then it will be parsed, otherwise arguments to parse will be taken from command line.

Simple example

from argser import parse_args

class Args:
    a = 'a'
    foo = 1
    bar: bool
    bar_baz = 42, "bar_baz help"

args = parse_args(Args, show=True)
argparse alternative
from argparse import ArgumentParser

parser = ArgumentParser()
parser.add_argument('-a', type=str, default='a', help="str, default: 'a'")
parser.add_argument('--foo', '-f', dest='foo', type=int, default=1, help="int, default: 1")
parser.add_argument('--bar', '-b', dest='bar', action='store_true', help="bool, default: None")
parser.add_argument('--no-bar', '--no-b', dest='bar', action='store_false')
parser.add_argument('--bar-baz', dest='bar_baz', default=42, help="int, default: 42. bar_baz help")

args = parser.parse_args()
❯ python -a "aaa bbb" -f 100500 --no-b
>>> Args(bar=False, a='aaa bbb', foo=100500, bar_baz=42)
❯ python -h
usage: [-h] [--bar] [--no-bar] [-a A] [--foo F] [--bar-baz B]

optional arguments:
    -h, --help           show this help message and exit
    --bar, -b            bool, default: None
    --no-bar, --no-b
    -a A                 str, default: 'a'
    --foo F, -f F        int, default: 1
    --bar-baz B, --bb B  int, default: 42. bar_baz help

Get arguments from function

import argser

def foo(a, b: int, c=1.2):
    return [a, b, c]

assert, '1 2 -c 3.4') == ['1', 2, 3.4]


from argser import parse_args, sub_command

class Args:
    a: bool
    b = []
    c = 5
    class SubArgs:
        d = 1
        e = '2'
    sub = sub_command(SubArgs, help='help message for sub-command')

args = parse_args(Args, '-a -b a b -c 10', parser_help='help message for root parser')
assert args.a is True
assert args.b == ['a', 'b']
assert args.c == 10
assert args.sub is None

args = parse_args(Args, '--no-a -c 10 sub -d 5 -e "foo bar"')
assert args.a is False
assert args.sub.d == 5
assert args.sub.e == 'foo bar'
❯ python -h
usage: [-h] [-a] [--no-a] [-b [B [B ...]]] [-c C] {sub} ...

positional arguments:

optional arguments:
    -h, --help      show this help message and exit
    -a              bool, default: None
    -b [B [B ...]]  List[str], default: []
    -c C            int, default: 5
❯ python sub1 -h
usage: sub [-h] [-d D] [-e E]

help message for sub-command

optional arguments:
    -h, --help  show this help message and exit
    -d D        int, default: 1
    -e E        str, default: '2'

Can be deep nested:

from argser import parse_args, sub_command

class Args:
    a = 1
    class Sub1:
        b = 1
        class Sub2:
            c = 1
            class Sub3:
                d = 1
            sub3 = sub_command(Sub3)
        sub2 = sub_command(Sub2)
    sub1 = sub_command(Sub1)

args = parse_args(Args, '-a 1 sub1 -b 2 sub2 -c 3 sub3 -d 4')

Sub-commands from functions

import argser
subs = argser.SubCommands()

def foo():
    return 'foo'

@subs.add(description="foo bar")  # with additional arguments for sub-parser
def bar(a, b=1):
    return [a, b]

assert subs.parse('foo') == 'foo'
assert subs.parse('bar 1 -b 2') == ['1', 2]

Project details

Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Files for argser, version 0.0.13
Filename, size File type Python version Upload date Hashes
Filename, size argser-0.0.13-py3-none-any.whl (17.3 kB) File type Wheel Python version py3 Upload date Hashes View hashes
Filename, size argser-0.0.13.tar.gz (16.7 kB) File type Source Python version None Upload date Hashes View hashes

Supported by

Elastic Elastic Search Pingdom Pingdom Monitoring Google Google BigQuery Sentry Sentry Error logging AWS AWS Cloud computing DataDog DataDog Monitoring Fastly Fastly CDN SignalFx SignalFx Supporter DigiCert DigiCert EV certificate StatusPage StatusPage Status page