Parse Non-pre-defined Argument

Is there any library that can parse random key value pairs in sys.argv in Python? For example: python run.py --v1 k1 --v2 k2 --v3 k3 Should return me a dictionary like {v1->k1

Solution 1:

It's kind of hacky, but you do have this:

import argparse
import collections
parser = argparse.ArgumentParser()
known, unknown_args = parser.parse_known_args()

unknown_options = collections.defaultdict(list)
key = None
forargin unknown_args:
    ifarg.startswith('--'):
        key = arg[2:]
    else:
        unknown_options[key].append(arg)

Solution 2:

d = {}
for i,argin enumerate(sys.argv):
    ifarg.startswith("--"):
        d[arg[2:]] = sys.argv[i+1]

print d

Solution 3:

In a newer Python that uses dictionary comprehension you could use a one liner like this:

ll = sys.argv[1:]
args = {k[2:]:v for k,v inzip(ll[::2], ll[1::2])}
# {'v1': 'k1', 'v2': 'k2', 'v3': 'k3'}

It doesn't have any flexibility in case your user screws up the pairing, but it would be a quick start.

A generator could be used to pop pairs of strings off the sys.argv[1:]. This would be a good place to build in flexibility and error checking.

deffoo(ll):
    ll = iter(ll)
    while ll:
        yield ll.next()[2:], ll.next()
{k:v for k,v in foo(ll)}