Question of Optionparse

[Peter Otten]

Pekka Niiranen wrote:

> How can I STOP Optionparse to process boolean
> value as parameter. See this:
> 
>  >>> parser = optparse.OptionParser()
>  >>> parser.add_option("-x",dest='xxx', action="store_true",help="xxx")
>  >>> parser.add_option("-r",dest='root',help="directory",type="string")
>  >>> args = ["-r", "d:", "-x"]
>  >>> parser.parse_args(args)
> (<Values at 0x13bbbc0: {'xxx': True, 'root': 'd:'}>, [])
> 
> Last line is correct: boolean 'xxx' gets set 'True'
> and parameter 'root' to 'd:'
> 
> However when value is NOT given for '-r' but '-x' exists:
> 
>  >>> args = ["-r", "-x"]
>  >>> parser.parse_args(args)
> (<Values at 0x13ccf80: {'xxx': None, 'root': '-x'}>, [])
> 
> This is BS: I expected 'root' to be None and 'xxx' to be 'True'.
> How can I make it so?

I think you need a callback option.

> Another question: Is there a way to store options
> directly into user defined dictionary without assignment
> like this:
> 
> my_environment_values = {}
> (options, args) = parser.parse_args()
> environment_values["xxx"] = options.xxx

environment_values.update(options.__dict__)

Full example:

import optparse

def callback(option, opt, value, parser):
    rargs = parser.rargs
    if rargs and not rargs[0].startswith("-"):
        parser.values.root = rargs.pop(0)
    else:
        parser.values.root = "<no value provided>"
    
parser = optparse.OptionParser()
parser.add_option("-x", "--xtra-terrestrial", action="store_true")
parser.add_option("-r", "--root", action="callback", callback=callback)

options, args = parser.parse_args()

environment = {}
environment.update(options.__dict__)

print environment

Peter