Making Python loggers output all messages to stdout in addition to log file

All logging output is handled by the handlers; just add a logging.StreamHandler() to the root logger.

Here's an example configuring a stream handler (using stdout instead of the default stderr) and adding it to the root logger:

import loggingimport sysroot = logging.getLogger()root.setLevel(logging.DEBUG)handler = logging.StreamHandler(sys.stdout)handler.setLevel(logging.DEBUG)formatter = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s')handler.setFormatter(formatter)root.addHandler(handler)

The simplest way to log to stdout:

import loggingimport syslogging.basicConfig(stream=sys.stdout, level=logging.DEBUG)

You could create two handlers for file and stdout and then create one logger with handlers argument to basicConfig. It could be useful if you have the same log_level and format output for both handlers:

import loggingimport sysfile_handler = logging.FileHandler(filename='tmp.log')stdout_handler = logging.StreamHandler(sys.stdout)handlers = [file_handler, stdout_handler]logging.basicConfig(    level=logging.DEBUG,     format='[%(asctime)s] {%(filename)s:%(lineno)d} %(levelname)s - %(message)s',    handlers=handlers)logger = logging.getLogger('LOGGER_NAME')