xonsh + argparse

[Kurt Sansom]

I would like to use xonsh with argparse, but there is something I clearly missing. 

```

#!/usr/bin/env xonsh

import argparse

parser = argparse.ArgumentParser(description='set version.')\

parser.add_argument('version', metavar='v', type=str,

  default="3.15.4",

  help='version string to install')

args = parser.parse_args()

print(args)

```

When I run the command I get an error. 

```

../test_script.xsh -v "3.15.3"

usage: test_script.xsh [-h] v

test_script.xsh: error: unrecognized arguments: -v

```

what is the proper way to get arguments into a script?

~Kurt

[Kurt Sansom]

I realized I missed setting what v and i mean 

[Kurt Sansom]

should be this I think instead.

```

parser.add_argument('--version' ,"-v", dest="version", type=str,

default="3.15.4",

help='version string to install')

```