Optional debugging feature

[pytransitions]

Optional debugging feature

[tyarkoni]

Great idea! I won't have time to take this on for a couple of weeks, but would be very happy to consider PRs.

[lulingar]

I would love to contribute, but in quick reading core.py I got a little overwhelmed since the code, despite being well written, is rather long. If you have a suggestion where I could add logging hooks safely, I would give it a shot.

[tyarkoni]

Sure--let me get back to you after Friday. :)

[tyarkoni]

Sorry @lulingar, just realized I never followed up on this. I just added very basic logging in a17617e. This could be improved in various ways (e.g., assigning all logged events to named constants, adding messages for other events, allowing writing to file, or adding metadata like timestamp and Machine instance to the logs). All logged events are at INFO level right now, and I haven't changed the default loglevel, so to output the logs to stdout, one just has to import the logger from the module and set its level appropriately before running. I.e.,

import logging
from transitions import logger
logger.setLevel(logging.INFO)

Then you should have a record of transitions, state changes, and fired callbacks.

I'm closing this for now, but feel free to re-open if any issues arise.