Script won't accept argument

I'm making a script buildt with code from the google ads api. In this script I'm trying to make a new account, and for that to happen, i need to select which manager account the script should be under. That is done with this code:

parser = argparse.ArgumentParser(description=('Creates a new client under the given manager.')) # The following argument(s) should be provided to run the example. parser.add_argument('-m', '--manager_customer_id', type=str,                     required=True, help='A Google Ads customer ID for the '                     'manager account under which the new customer will '                     'be created.') args = parser.parse_args() 

So when i run the script, i type in python new_acc.py xxx-xxx-xxxx and hit enter, and then i get the following error:

usage: new_acc.py [-h] -m MANAGER_CUSTOMER_ID new_acc.py: error: the following arguments are required: -m/--manager_customer_id 

I have also tried to add the manager_customer_id in the .yaml file.