I'd like to capture the current value of an option --prefix=<whatever> along
with a positional value as it is seen by argparse.
Example:
python script.py -p1 alpha beta -p2 gamma -p3
should result in a list
[(1, "alpha"), (1, "beta"), (2, "gamma")]
Here's a working script that uses --name=<some-value> instead of of just
<some-value>:
$ cat tmp.py
import argparse
parser = argparse.ArgumentParser()
parser.add_argument("-p", "--prefix")
parser.add_argument("-n", "--name")
class Namespace(object):
def __init__(self):
self.pairs = []
self.prefix = None
def set_name(self, value):
if value is not None:
self.pairs.append((self.prefix, value))
name = property(None, set_name)
ns = Namespace()
parser.parse_args(namespace=ns)
print ns.pairs
$ python tmp.py -p1 -nalpha -nbeta -p2 -ngamma
[('1', 'alpha'), ('1', 'beta'), ('2', 'gamma')]
However, modifying the --name option to a positional with
parser.add_argument("name", nargs="*")
results in an error:
$ python tmp2.py -p1 alpha beta -p2 gamma
usage: tmp2.py [-h] [-p PREFIX] [name [name ...]]
tmp2.py: error: unrecognized arguments: gamma
Am I missing a simple way to avoid that?
Peter
PS: I've not yet "used the source" ;)
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