python - Easier way to enable verbose logging

Question

I want to add a debug print statement test, if I enable --verbose from the command line and if I have the following in the script.

logger.info("test")

I went through the following questions, but couldn't get the answer...

• How to implement the --verbose or -v option into a script?

• Python logging - Is there something below DEBUG?

Answer 1

I find both --verbose (for users) and --debug (for developers) useful. Here's how I do it with logging and argparse:

import argparse
import logging

parser = argparse.ArgumentParser()
parser.add_argument(
    '-d', '--debug',
    help="Print lots of debugging statements",
    action="store_const", dest="loglevel", const=logging.DEBUG,
    default=logging.WARNING,
)
parser.add_argument(
    '-v', '--verbose',
    help="Be verbose",
    action="store_const", dest="loglevel", const=logging.INFO,
)
args = parser.parse_args()    
logging.basicConfig(level=args.loglevel)

So if --debug is set, the logging level is set to DEBUG. If --verbose, logging is set to INFO. If neither, the lack of --debug sets the logging level to the default of WARNING.