Basic Python logging usage

__main__.py

#!/usr/bin/env python3
#
# I do this infrequently enough I always forget how this stuff works and have to read the code to figure it out.
#

import logging
import sys

formatter = logging.Formatter(
    fmt='%(asctime)s - %(levelname)s - %(message)s',
    datefmt=None,
)
handler = logging.StreamHandler(sys.stderr)
handler.setFormatter(formatter)

logger = logging.getLogger("foo")
logging.getLogger().addHandler(handler)


def main(args):
  if "--verbose" in args:
      logging.getLogger().setLevel(level="DEBUG")

  logging.warning("logging warning")
  logger.warning("logger warning")
  logger.debug("logger debug")
  logger.info("logger info")

if __name__ == "__main__":
  main(sys.argv)