A solid logging setup: rich format, rotating file handler so logs don't fill the disk, plus a console handler at a higher level so noisy DEBUG only goes to the file.
Python
import logging
from logging.handlers import RotatingFileHandler
from pathlib import Path
def setup_logging(log_dir: str = "logs", level: int = logging.INFO) -> None:
Path(log_dir).mkdir(parents=True, exist_ok=True)
fmt = logging.Formatter(
"%(asctime)s %(levelname)-7s [%(name)s] %(message)s",
datefmt="%Y-%m-%dT%H:%M:%S",
)
root = logging.getLogger()
root.setLevel(logging.DEBUG)
# File: everything, rotated at 5 MB × 3 backups
fh = RotatingFileHandler(f"{log_dir}/app.log", maxBytes=5_000_000, backupCount=3)
fh.setFormatter(fmt); fh.setLevel(logging.DEBUG); root.addHandler(fh)
# Console: INFO and up only
ch = logging.StreamHandler()
ch.setFormatter(fmt); ch.setLevel(level); root.addHandler(ch)
setup_logging(level=logging.INFO)
log = logging.getLogger("myapp.startup")
log.info("Service started on port %d", 8080)
log.debug("This goes to file only")Save your own code snippets
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