import logging
from logging import Logger
import os
import sys


def getLogger(name: str = 'root', loglevel: str = 'INFO') -> Logger:
    logger = logging.getLogger(name)

    # if logger 'name' already exists, return it to avoid logging duplicate
    # messages by attaching multiple handlers of the same type
    if logger.handlers:
        return logger
    # if logger 'name' does not already exist, create it and attach handlers
    else:
        # set logLevel to loglevel or to INFO if requested level is incorrect
        loglevel = getattr(logging, loglevel.upper(), "INFO")
        logger.setLevel(loglevel)
        if loglevel == logging.DEBUG:
            fmt = '%(asctime)s %(levelname)-8s %(message)s (%(filename)s)'
        else:
            fmt = '%(asctime)s %(levelname)-8s %(message)s'
        fmt_date = '%Y-%m-%dT%T'
        formatter = logging.Formatter(fmt, fmt_date)
        handler = logging.StreamHandler()
        handler.setFormatter(formatter)
        logger.addHandler(handler)

        if logger.name == 'root':
            logger.warning(
                'Running: %s %s',
                os.path.basename(sys.argv[0]),
                ' '.join(sys.argv[1:]))
    return logger