On 23Jan2023 13:46, 2qdxy4rzwzuui...@potatochowder.com
<2qdxy4rzwzuui...@potatochowder.com> wrote:
On 2023-01-22 at 18:19:13 -0800,
Jach Feng <jf...@ms4.hinet.net> wrote:
1) Modify the sys.argv by inserting an item '--' before parsing it,
ie.
sys.argv.insert(1, '--')
args = parser.parse_args()
Please don't do that. :-)
Well... We routine mmodify argv when parsing a command line. It's just a
list. It does assume I'm the only user of it.
In my mind, sys.argv belongs to Python, not the application. Instead,
pass a newly created argument list to parse_args:
args = parser.parse_args(['--'] + sys.argv)
I do sometimes copy it:
def main(argv):
argv = list(argv)
for exactly the reasons you're alluding to. Then I'm free to modify the
copy.
But for Jach Feng: the "--" is really expected as something the user
does when they invoke your programme, _explicitly_ saying that what
follows from here is not an argument. So the user is expected to type:
your_script -x -y -- "-4^2+5.3*abs(-2-1)/2"
where there are -x and -y options, then end of options, then an
argument, which would look like an option if there wasn't the "--"
argument.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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