how to set logging level from command line

The basicConfig function can take a string argument for level, and it will check its validity for you, so the code can be much simpler than BarryPye’s answer.

import argparse
import logging

parser = argparse.ArgumentParser()
parser.add_argument( '-log',
                     '--loglevel',
                     default="warning",
                     help='Provide logging level. Example --loglevel debug, default=warning' )

args = parser.parse_args()

logging.basicConfig( level=args.loglevel.upper() )
logging.info( 'Logging now setup.' )