CODEWITHSUNDEEP
python
sdot257
sdot257

Reputation: 10376

Python - Passing argparse variables into class

Using Python 2.6, I want to pass args to the class but I'm getting the following error.

Traceback (most recent call last):
File "./myscript.py", line 95, in <module>
args = get_parser().parse_args()
File "./myscript.py", line 22, in get_parser
generate_mutex.set_defaults(func=ns_calls.generate_lbvs_bindings)
NameError: global name 'ns_calls' is not defined

Main script:

# myscript.py
from myclassfile import *

def get_parser():
    parser = argparse.ArgumentParser()
    subparsers = parser.add_subparsers(dest="subparser_name")

    generate = subparsers.add_parser('generate')
    generate_mutex = generate.add_mutually_exclusive_group(required=True)
    generate_mutex.add_argument('-g', '--servicegroupname', help='The servicegroup name.',metavar='<servicegroup name>')
    generate_mutex.add_argument('-l', '--lbvservername', help='The virtual erver name to which the service is bound.',metavar='<lbvserver name>')
    generate_mutex.set_defaults(func=ns_calls.generate_lbvs_bindings)

if __name__ == "__main__":
    args = get_parser().parse_args()
    args.func(args)
    ns_calls = NetscalerCalls(args)

My module file:

# myclassfile.py

class NetscalerCalls(object):
    def __init__(self, args):
        self.lbvservername = args.lbvservername
        self.servername = args.servername

Upvotes: 1

Views: 357

Answers (2)

Vasili Syrakis
Vasili Syrakis

Reputation: 9631

You didn't put the args in here:

ns_calls = NetscalerCalls()
                          ^

This is invalid according to the class you created, where __init__ requires (self, args).

When you initiate the class, it passes in self automatically. So you need to pass in the args when initiating the class.

For example:

# myscript.py
from myclassfile import *

...
...

if __name__ == "__main__":
    args = get_parser().parse_args()
    args.func(args)
    ns_calls = NetscalerCalls(args)

If you try to pass in args before it is declared, it will fail

That is why I have placed the variable declaration for ns_calls underneath the declaration for args

Upvotes: 3

Eric Renouf
Eric Renouf

Reputation: 14520

Your init requires you to pas an args parameters, but when you do the line ns_calls = NetscalerCalls() you aren't passing that parameter in so it complains. You would have to that line after you have the args object you want then do ns_calls = NetscalerCalls( args )

Upvotes: 1

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