Configure logging

XWhy uses the standard Python logger named xwhy.

import logging
import sys

logger = logging.getLogger("xwhy")
logger.setLevel(logging.INFO)

if not logger.handlers:
    handler = logging.StreamHandler(sys.stdout)
    handler.setFormatter(
        logging.Formatter("%(asctime)s | %(levelname)s | %(name)s | %(message)s")
    )
    logger.addHandler(handler)

The handler guard prevents duplicate log lines when a notebook cell is executed repeatedly.