Python Strict Fire

Strict Fire is a temporary patch to the Fire python library. Whereas Fire currently ignores unknown arguments*, StrictFire always complains by default. Be aware that this breaks function chaining. For those cases you can keep using fire.Fire alongside strictfire.StrictFire.

* Fire runs the function first, then complains about unknown arguments. StrictFire does not run anything if there are unknown arguments.

Quick Guide

pip install strictfire

To use, replace the Fire() method with StrictFire()

from strictfire import StrictFire

def myfunc(arg1, arg2=0):
  print((arg1, arg2))

StrictFire(myfunc)

Things work like before

$ python test.py --arg1 1 --arg2 2
(1, 2)

Except if you pass an unexpected argument

$ python test.py --arg1 1 --arg3 2
ERROR: Unknown arguments: ['--arg3', '2']
Usage: test.py ARG1 <flags>
  optional flags:        --arg2

For detailed information on this command, run:
  test.py --help

Notes

Refer to this Issue for more information.

This fork was created because the current non-strict behavior is risky in production, and though other solutions exist (e.g. decorators), they would add code overhead to several projects.

There is no intention of disrespecting the original project / authors. Their position on the matter of non-strict default behavior, and not breaking existing workflows is very reasonable. I wouldn't be surprised if their efforts to address this on the main project deprecates this fork in a few months. Until then, this is simply a temporary fix for myself and others. If the original authors have any issues with this unofficial fork / pypi entry, please contact me and I will take them down.

I use Fire every day and think it's great. Thank you to its authors!