Python: logging module - globally

Question

I was wondering how to implement a global logger that could be used everywhere with your own settings:

I currently have a custom logger class:

class customLogger(logging.Logger):    ... 

The class is in a separate file with some formatters and other stuff. The logger works perfectly on its own.

I import this module in my main python file and create an object like this:

self.log = logModule.customLogger(arguments) 

But obviously, I cannot access this object from other parts of my code. Am i using a wrong approach? Is there a better way to do this?

Answer 1

Use logging.getLogger(name) to create a named global logger.

main.py

import log logger = log.setup_custom_logger('root') logger.debug('main message')  import submodule 

log.py

import logging  def setup_custom_logger(name):     formatter = logging.Formatter(fmt='%(asctime)s - %(levelname)s - %(module)s - %(message)s')      handler = logging.StreamHandler()     handler.setFormatter(formatter)      logger = logging.getLogger(name)     logger.setLevel(logging.DEBUG)     logger.addHandler(handler)     return logger 

submodule.py

import logging  logger = logging.getLogger('root') logger.debug('submodule message') 

Output

2011-10-01 20:08:40,049 - DEBUG - main - main message 2011-10-01 20:08:40,050 - DEBUG - submodule - submodule message