Python: argparse taking a list of variable size

Question

In Python, using argparse, I want an input argument to take a variable number of files, like:

$ myScript --aParameter file1 file2 file3 ... fileN

How can do it?

parser.add_argument( "--aParameter", nargs=????, type=str,
                        help="Provide a list of files to analyze",
                        default=None)

wim · Accepted Answer · 2013-04-29 14:18:23Z

15

Use the kwarg nargs='+'. That's pretty much all there is to it.

answered Apr 29, 2013 at 14:18

wim

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2 Comments

mgilson Over a year ago

Or, nargs='*' if you want to support the ability to have an empty list.

Fabien Snauwaert Over a year ago

Documented here: docs.python.org/3/library/argparse.html#nargs

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