How to use nargs="+" with default list/vector?

[hermidalc]

Sorry noob question here, in python's arparse you can do:

parser.add_argument("--foo", type=str, nargs="+", default=["A", "B", "C"])

but in r-argparse I get an error if I do:

parser$add_argument("--foo", type="character", nargs="+", default=c("A", "B", "C"))

[trevorld]

Please provide a minimal, reproducible example. The extended version of your example seems to work like the Python equivalent:

parser = argparse::ArgumentParser()
parser$add_argument("--foo", type="character", nargs="+", default=c("A", "B", "C"))
args = parser$parse_args()
print(args)

~/tmp$ Rscript test.R
$foo
[1] "A" "B" "C"
~/tmp$ Rscript test.R --foo bar boo
$foo
[1] "bar" "boo"

import argparse
parser = argparse.ArgumentParser()
parser.add_argument("--foo", type=str, nargs="+", default=["A", "B", "C"])
args = parser.parse_args()
print(args)

~/tmp$ python3 test.py 
Namespace(foo=['A', 'B', 'C'])
~/tmp$ python3 test.py --foo bar boo
Namespace(foo=['bar', 'boo'])

[hermidalc]

Very sorry @trevorld, I was getting an error that was something like "+" ... comparison only possible for atomic and list types ..., but I realize now my syntax checker didn't highlight that I was missing a comma after nargs="+" and before the next param, thank you for the response