Re: CLI Arguments That Call Functions?

[Ian Kelly]

On Thu, Jun 18, 2015 at 11:56 AM, Tony the Tiger tony@tiger.invalid wrote:
 I would have assumed there would be something built in to the
 ArgumentParser, but I can't detect anything that seems to do what I want,
 so I wrote the following:

[SNIP]

 So, is there something already in the Python libs? Do I continue with
 this? Or what?

 There ought to be something already built in to Python, but I think I've
 missed it. Sure hope so. I'd hate to continue with this mess.


You can specify custom actions for arguments. See
https://docs.python.org/3.4/library/argparse.html#action-classes

For example (untested):

class AppendCallable(argparse.Action):

def __call__(self, parser, namespace, values, option_string):
callables = getattr(namespace, self.dest, None) or []
callables.append(functools.partial(self.const, *values))
setattr(namespace, self.dest, callables)

def main():
parser = argparse.ArgumentParser()
parser.add_argument(
'-a', '--alfa',
action=AppendCallable,
const=option_alfa,
dest='callables',
nargs=1,
type=int)

parser.add_argument(
'-b', '--bravo',
action=AppendCallable,
const=option_bravo,
dest='callables',
nargs=0)

args = parser.parse_args()
for callable in args.callables:
callable()

You might also be interested in reading
https://docs.python.org/3.4/library/argparse.html#sub-commands in case
that's related to what you're trying to accomplish.
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Re: CLI Arguments That Call Functions?

[Michael Torrie]

On 06/18/2015 12:08 PM, Tony the Tiger wrote:
 Forgot to add, I don't read or see anything posted from outside of the 
 groups. 

Posting from the mailing list here.  I assume the nntp gateway is
two-way.  Unless you're manually blocking message originating in google
groups, I don't see why you wouldn't pick them up (bad formatting and
all) on Usenet.  If not, you're not missing anything, nor are we here
outside of usenet.
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