Setting up the argparser already has some (little) added value.

examples/argparse/argparse_basic.py
from __future__ import print_function
import argparse

parser = argparse.ArgumentParser()
parser.parse_args()

print('the code...')

Running the script without any parameter will not interfere...

$ python argparse_basic.py
the code...

If the user tries to pass some parameters on the command line, the argparser will print an error message and stop the execution.

$ python argparse_basic.py foo
usage: argparse_basic.py [-h]
argparse_basic.py: error: unrecognized arguments: foo
$ python argparse_basic.py -h
usage: argparse_basic.py [-h]

optional arguments:
  -h, --help  show this help message and exit

The minimal set up of the argparse class already provides a (minimally) useful help message.