Argparse: multiple choices with 'if' and 'else'

My question is about argparse and how to use multiple choices.

So I declare two choices --country and --city

import argparse

parser = argparse.ArgumentParser()                                                  
parser.add_argument('--country', dest='country', type=str, metavar='') 
parser.add_argument('--city', dest='city', type=str, metavar='')

I then declare it into the script few lines below:

if args.country:
        # Do this 
elif args.city: 
        # Do this

But it is not working and the script is executing the first and the second option. It seems so easy to me. Where am I wrong?