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Ophelia Taylor
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Asked: 2022-04-20T18:23:21+00:00 In:

Python Argparse Multiple Values Samples

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I am new to python. I need some suggestions on python argparse multiple values. Will you help me? Thank you!

♦ Suggestions of ITtutoria Team
Python argparse multiple values:

ArgumentParser.add_argument(name or flags…[, action][, nargs][, const][, default][, type][, choices][, required][, help][, metavar][, dest])

Learn more about the add_argument method here https://docs.python.org/3/library/argparse.html

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5 Answers

  1. Best Answer

    I recommend the following method would help

    import argparse
​
parser = argparse.ArgumentParser()
​
# By default it will fail with multiple arguments.
parser.add_argument('--default')
​
# Telling the type to be a list will also fail for multiple arguments,
# but give incorrect results for a single argument.
parser.add_argument('--list-type', type=list)
​
# This will allow you to provide multiple arguments, but you will get
# a list of lists which is not desired.
parser.add_argument('--list-type-nargs', type=list, nargs='+')
​
# This is the correct way to handle accepting multiple arguments.
# '+' == 1 or more.
# '*' == 0 or more.
# '?' == 0 or 1.
# An int is an explicit number of arguments to accept.
parser.add_argument('--nargs', nargs='+')
​
# To make the input integers
parser.add_argument('--nargs-int-type', nargs='+', type=int)
​
# An alternate way to accept multiple inputs, but you must
# provide the flag once per input. Of course, you can use
# type=int here if you want.
parser.add_argument('--append-action', action='append')
​
# To show the results of the given option to screen.
for _, value in parser.parse_args()._get_kwargs():
    if value is not None:
        print(value)
​
    • 23
  2. parser.add_argument('-l','--list', nargs='+', help='<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
​
    • 14

  3. Anyone find the solution? I got it and that is a basic method

    parser.add_argument("--list", nargs="+", default=["a", "b"])
​
SHELL
$ python3 example.py --list a b c
# List would look like ['a','b','c']
    • 13

  4. I’m guessing that this will work.

    ...
parser.add_argument('--val',
                    choices=['a', 'b', 'c'],
                    help='Special testing value')
​
args = parser.parse_args(sys.argv[1:])
    • 12

  5. Here is the quick fix for this question

    parser.add_argument('-l','--list', nargs='+', help='<Required> Set flag', required=True)
# Use like:
# python arg.py -l 1234 2345 3456 4567
    • 11

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