logger stdout stderr 出し分け

sample.py

import logging
import sys


class StdoutFilter(logging.Filter):
    def filter(self, record):
        return record.levelno < logging.WARNING


class StderrFilter(logging.Filter):
    def filter(self, record):
        return record.levelno >= logging.WARNING


logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

handler = logging.StreamHandler(sys.stdout)
handler.setLevel(logging.DEBUG)
handler.addFilter(StdoutFilter())
logger.addHandler(handler)

err_handler = logging.StreamHandler(sys.stderr)
err_handler.setLevel(logging.WARNING)
err_handler.addFilter(StderrFilter())
logger.addHandler(err_handler)

logger.warning('stderr')
logger.info('stdout')