import sys

import logging

class Logger(object):

DEBUG = logging.DEBUG

INFO = logging.INFO

ERROR = logging.ERROR

def __init__(self):

self._consumers = []

consumer = logging.getLogger('info')

consumer.setLevel(Logger.INFO)

hdlr = logging.StreamHandler(sys.stdout)

hdlr.setFormatter(logging.Formatter("%(message)s"))

consumer.addHandler(hdlr)

self.add_consumer(Logger.INFO, consumer)

consumer = logging.getLogger('error')

consumer.setLevel(Logger.ERROR)

hdlr = logging.StreamHandler(sys.stderr)

hdlr.setFormatter(logging.Formatter("%(levelname)s: %(message)s"))

consumer.addHandler(hdlr)

self.add_consumer(Logger.ERROR, consumer)

def debug(self, msg, *args, **keys):

self._log(Logger.DEBUG, msg, *args, **keys)

def info(self, msg, *args, **keys):

self._log(Logger.INFO, msg, *args, **keys)

def error(self, msg, *args, **keys):

self._log(Logger.ERROR, msg, *args, **keys)

def _log(self, level, msg, *args, **keys):

for (consumer_level, consumer) in self._consumers:

if level == consumer_level:

consumer.log(level, msg, *args, **keys)

def add_consumer(self, level, consumer):

self._consumers.append((level, consumer))

logger = Logger()