Google App Engine/Python - Change logging formatting

How can one change the formatting of output from the logging module in Google App Engine?

I've tried, e.g.:

  log_format = "* %(asctime)s %(levelname)-8s %(message)s"
  date_format = "%a, %d %b %Y %H:%M:%S"

  console = logging.StreamHandler()
  fr = logging.Formatter(log_format)
  console.setFormatter(fr)

  logger = logging.getLogger()
  logger.addFilter(SuperfluousFilter())
  logger.addHandler(console)

  logger.setLevel(logging.DEBUG)
  cons开发者_如何学Cole.setLevel(logging.DEBUG)

  logging.error("Reconfiguring logging")

However this results in duplicate logging output: One with the logging handler from google/appengine/tools/dev_appserver.py (or somewhere in the Google code), and one from my new StreamHandler above. The above code outputs:

ERROR    2010-06-23 20:46:18,871 initialize.py:38] Reconfiguring logging
2010-06-23 20:46:18,871 ERROR    Reconfiguring logging

Where the top line is clearly from dev_appserver.py, the bottom line from my code.

So I guess the corollary question is: How can change the formatting of Google App Engine, yet avoid the duplicate output?

Thank you for reading.

Brian

Here is one way you can change the logging format without duplicating output:

# directly access the default handler and set its format directly
logging.getLogger().handlers[0].setFormatter(fr)

This is a bit of a hack because you have to directly access the handlers list stored in the root logger. The problem is GAE automatically uses logging before your code is ever run - this creates a default handler. Unfortunately, I don't see how you can get a reference to this handler without directly accessing the handlers list as above.