New submission from Reuben Thomas:
In Python 3.5.2, with a positional argument with nargs='*', running the program
with no arguments gives an error like this:
usage: caffeinate [-h] [-V] COMMAND [ARGUMENT [ARGUMENT ...]]
caffeinate: error: the following arguments are required: COMMAND, ARGUMENT
Here it is clear from the (correct, though redundant) syntax that "ARGUMENT" is
optional, but the error message claims, incorrectly, that it is required.
The add_argument calls used were:
parser.add_argument('COMMAND', help='command to run')
parser.add_argument('ARGUMENT', nargs='*', help='arguments to COMMAND')
parser.add_argument('-V', '--version', action='version', version=PROGRAM_NAME +
' ' + VERSION)
----------
components: Library (Lib)
messages: 280052
nosy: rrt
priority: normal
severity: normal
status: open
title: argparse claims '*' positional argument is required in error output
type: behavior
versions: Python 3.5
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue28609>
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