Get a logger that can print to file and stream in one time.

mylogger.py

#!/usr/bin/env python
# -*- coding: utf-8 -*-

import logging


def get_logger():

    # Get a logger, default is the root logger.
    logger = logging.getLogger('mylogger')
    logger.setLevel(logging.INFO)

    # Create a handler which can print to file.
    fh = logging.FileHandler('test.log')

    # Create a handler which can print to stream.
    sh = logging.StreamHandler()

    # Set print formatter for handler.
    formatter = logging.Formatter(
        '%(asctime)s - %(name)s - %(levelname)s - %(message)s')
    fh.setFormatter(formatter)
    sh.setFormatter(formatter)

    # Add handler to logger.
    logger.addHandler(fh)
    logger.addHandler(sh)

    return logger

# Record one log.
logger = get_logger()
logger.info('Hello world!')