Simplest way to set up python logging to stdout

问题

I have the following to set up a basic logger to print output in a cron job:

import logging
log=logging.getLogger()
log.setLevel(logging.DEBUG)
log.addHandler(logging.StreamHandler())
log.info('hi')

Is this the most straightforward way to do this, or is there a better method?

回答1:

If you just need to print the messages to the stdout, then logging.basicConfig is a handy shortcut for the configuration you listed. It will create a StreamHandler, attach the default Formatter to it and attach the handler to the root logger.

import logging

logging.basicConfig(level=logging.DEBUG)
logging.getLogger().info('hi')

Check out the docs for more configuration possibilities; for example,

logging.basicConfig(filename='some.log', level=logging.DEBUG)

will configure writing to file some.log instead of stdout.

Note that logging.basicConfig won't do a thing if the logger is already configured (meaning that there are handlers attached to the root logger already). So this code:

import logging

logging.getLogger().addHandler(logging.FileHandler(filename='some.log'))
logging.basicConfig(level=logging.DEBUG)

will not configure logging to stdout anymore; you will have to do it yourself.

来源：https://stackoverflow.com/questions/51662409/simplest-way-to-set-up-python-logging-to-stdout