Python wrap stdout for logging purpose. However, this method is not support to write or read binary data from/to the standard streams.

stdout_wrapper.py

import logging
import sys

# Setup logger
logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)
handler = logging.FileHandler("./out.log")
formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')
handler.setLevel(logging.DEBUG)
handler.setFormatter(formatter)
logger.addHandler(handler)


class StdWrapper(object):
    def __init__(self, logger, std):
        self.old_std = std
        self.logger = logger or logging.getLogger()

    def write(self, *arg, **kwargs):
        if '\n' not in arg and ' ' != arg[-1]: # beautiful output
            msg = ''.join(map(str, arg)).replace('\n', "")
            logger.info(msg)
        self.old_std.write(*arg)

    def flush(self):
        self.old_std.flush()


wrap_stdout = StdWrapper(logger, sys.stdout)
sys.stdout = wrap_stdout