On Fri, 20 Mar 2009, Qian Xu wrote:
> Hi All,
>
> I have a problem with OptParse.
> I want to define such an arugument. It can accept additional value or no
> value.
>
> "myscript.py --unittest File1,File2"
> "myscript.py --unittest"
>
> Is it possible in OptParse? I have tried several combination. But ...
For reasons explained in the optparse documentation, it doesn't directly
support options which take an arbitrary number of arguments, to do that you
use a callback function like this:
import sys
from optparse import OptionParser
def my_callback(option, opt_str, value, parser):
"Accept options which take any number of arguments"
value = []
for item in parser.rargs:
if item[0] == '-': #stop at next option
break
value.append(item)
if not value:
value = True
setattr(parser.values, option.dest, value)
parser = OptionParser()
parser.add_option("--unittest", action="callback",
callback=my_callback, dest="unittest")
options = parser.parse_args(sys.argv[1:])[0]
Now if you invoke myscript.py with --unittest, options.unittest will
be 'True', with --unittest File1 File2, it will be ['File1', 'File2'], etc..
This doesn't work with the comma-separated argument example you gave, but it
could be made to; I hope the above gets you started. There are callback
examples in the optparse docs too.
Regards,
John
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