Set a local format for a bind logger

Hi, in some methods of a class I need to always log a set of values together with the message. But this should happen only in those methods. I think the bind method is the answer, but I can’t figure out how to format the message locally.

def f(i):
  context_logger = logger.bind(i=i)
  context_logger.info("Starting")
  ...
  context_logger.info("Ending")

Where to put the format for context_logger only without altering any other parameter?

[Delgan]

I just came to realization that you can use patch() also.

context_logger = logger.patch(lambda r: r.update(message=r["message"] + f" with param={param}"))
context_logger.info("Start")
context_logger.info("Something")
context_logger.info("Something else")
context_logger.info("End")

Be aware not to use it with opt(colors=True) because colorization won’t work due to implementation details.

[Delgan]

Thanks for the clarification. Currently, there is no easy way to achieve this. A possible workaround is to create a small utility function, although I agree this is not very satisfying.

def log(level, message):
    logger.log(level, message + f" with param={param}")

log("INFO", "Start")
log("INFO", "Something")
log("INFO", "Something else")
log("INFO", "End")

This is an interesting use case, though. It’s definitely something that should be possible in the future as I plan to make the message formatting customizable (see #318).