How to parse list of integers

Author: dineshbvadhiaCreated Aug 26, 2025Updated Mar 25, 2026

With argparse, you can do:

> python example.py --this 123
> python example.py --this 123 456
> python example.py --this 123 456 789

With Fire, how do you parse a list of integers (including a single element list) like argparse?

# example.py
import fire

def main(this: list[int]):
    print(type(this), this)

if __name__ == '__main__':
    fire.Fire(main)

> python example.py --this 123
<class 'int'> 123

> python example.py --this 123 456
ERROR: Could not consume arg: 456

> python example.py --this 123 456 789
ERROR: Could not consume arg: 456

Source: google/python-fire

View original on GitHub View discussion on GitHub