A very easy to use argument parser.

argv, CLI, argument
pip install fargv==0.1.7


fargv: The laziest command-line argument parser


pip3 pip install --user --upgrade git+https://github.com/anguelos/fargv

Usage in 3 Simple Steps!

Fast argument parser

  • Import
from fargv import fargv 
  • Define a dictionary with default parameters
params = {
    "anInt": 1,
    "aFloat": 0.1,
    "aBoolean": False,
    "anotherBoolean": True,
    "aString": "Hello",
    "aStringReference": "{aString} World",
    "anIntWithHelp": [2,"This would be the help"],
    "aChoice": [("choice1","choice2","choice3","choice4"),"And this must be the help"],
    "aPositionalSwitch": [set([]), "This is a convenient way to pass colections of things"]
  • Parse user provided argv to override defaults
new_params, help_str = fargv(params)
  • In shell:
my_program -anInt 34 -aFloat=2.3 -aBoolean -anotherBoolean=False


  • Type checking
  • Automatic help generation
  • Params usable as dictionary or struct
  • Can read environmental variables as well
  • macro-parameters
  • fast autocomplete generation
  • Switches with positional values


Static autocomplete for any program using fargv can be enabled with a single command.

The following command enables autocomplete for fargv_demo.py in the current shell where it is run.

source <(./examples/fargv_demo.py -bash_autocomplete)

fargv_demo.py should be an executable file employing the shebang (#!/usr/bin/env python3) or something equivalent. For a temporary solution, the autocomplete bash code can go in a script in /etc/bash_completion.d or in .bashrc.

Switch Macros

A switch might be a macro for other switches. This allows for example to break many files into a single root switch and all other switches beeing file names relative to that path.