Argument Parser error: "the following arguments are required:" - arguments

Question

I am newer to coding and can't figure out what to fix about my code to make this run. The error that I keep getting is this:
usage: submit.py [-h] [--username USERNAME] [--password PASSWORD]
[--location LOCATION] [--dry-run] [--report REPORT]
[--https | --http]
assign [tasks ...]
submit.py: error: the following arguments are required: assign
Below is the snippet of my program that the error is referring to, namely the line parser.add_argument('assign', help=next(ihelp))
import argparse
parser = argparse.ArgumentParser()
helps = [ 'assignment name'
, 'numbers or ranges of problems/tasks to submit'
, 'your username (you can make one up)'
, 'your password (optional)'
, 'your geographical location (optional, used for mapping activity)'
, 'display tests without actually running them'
, 'specify where to send the results'
, 'use an encrypted connection to the grading server'
, 'use an unencrypted connection to the grading server'
]
ihelp = iter(helps)
parser.add_argument('assign', help=next(ihelp))
parser.add_argument('tasks', default=profile.get('TASKS',None), nargs='*', help=next(ihelp))
parser.add_argument('--username', '--login', default=profile.get('USERNAME',None), help=next(ihelp))
parser.add_argument('--password', default=profile.get('PASSWORD',None), help=next(ihelp))
parser.add_argument('--location', default=profile.get('LOCATION',None), help=next(ihelp))
parser.add_argument('--dry-run', default=False, action='store_true', help=next(ihelp))
parser.add_argument('--report', default=profile.get('REPORT',None), help=next(ihelp))
group = parser.add_mutually_exclusive_group()
group.add_argument('--https', dest="protocol", const="https", action="store_const", help=next(ihelp))
group.add_argument('--http', dest="protocol", const="http", action="store_const", help=next(ihelp))
parser.add_argument('--verbose', default=False, action='store_true', help=argparse.SUPPRESS)
parser.add_argument('--show-submission', default=False, action='store_true', help=argparse.SUPPRESS)
parser.add_argument('--show-feedback', default=False, action='store_true', help=argparse.SUPPRESS)
args = parser.parse_args()
asgn_name = os.path.splitext(args.assign)[0]
report = args.report
location = args.location
dry_run = args.dry_run
I have tried some things from the internet like changing the line into this: args = parser.parse_args(args) and I have tried adding a default=profile to the assign line like the rest of the parser lines, but that didn't change the error.
I would really welcome any help, as I need to get this fixed by tonight!

Answer 1

It really depends on what you are trying to do.
If all you want is to make it run then you can simply add nargs="?" to the assign argument declaration. This however will make the argument optional, which may or may not be your intention.
parser.add_argument('assign', help=next(ihelp), nargs="?", default=profile.get("Some Default Value"))