Specifying parser in a function using non-module reference

I have a function in a file which parses arguments:

def get_args():
    #Set up parser and top level args
    parser = argparse.ArgumentParser(description='ASCENT: Automated Simulations to Characterize Electrical Nerve Thresholds')
    parser.add_argument('run_indices', nargs = '+', help = 'Space separated indices to submit NEURON sims for')
    parser.add_argument('-p','--partition', help = 'If submitting on a cluster, overrides default partition assignment')
    args = parser.parse_args()
    return args

This file is not part of a module, therefore I am using the filename to point to the function:

Command-Line Arguments
***********************

submit.py
---------

.. argparse::
   :filename: ../../src/neuron/submit.py
   :func: parser
   :prog: submit.py

This results in the following error:

Exception occurred:
  File "/home/docs/checkouts/readthedocs.org/user_builds/ascent-docs/envs/latest/lib/python3.7/site-packages/sphinxarg/ext.py", line 476, in run
    func = mod[attr_name]
KeyError: 'parser'

I am assuming since it is contained within a function, sphinx-argparse cannot find the parser object. How can I point to the parser within the function get_args()?

Thanks!

Start in sphinxarg/ext.py around the failing run method and compare its :func: lookup with the get_args() and parser definitions shown in the issue. Reproduce the Sphinx build using the submit.py and argparse directive, then confirm the intended behavior for a parser created inside a function.