Logging - simple mistake

I recently ran into a problem where my logging started to duplicate each log message, but in a different format after one particular logging call.

I could not track down the error, until I actually read what I wrote:

import logging

logger = logging.getLogger("a.logger")

class Something:
    ...
    logging.debug("a message")

I'd accidentally called debug on the logging module, not my logger. Everything I was googling was pointing towards enabling the default logging config (e.g.

logging.basicConfig()

) but I hadn't done so.

Easy mistake to make, thought I'd briefly write about it.