Handlers, Formatters, and Filters
Route log output to files, streams, and custom destinations.
Handlers Route Log Records
A handler sends log records to a destination: console, file, HTTP endpoint, etc. One logger can have multiple handlers.
import logging
logger = logging.getLogger("myapp")
logger.setLevel(logging.DEBUG)
sh = logging.StreamHandler()
logger.addHandler(sh)
logger.info("Goes to console")StreamHandler
StreamHandler writes to a stream (default sys.stderr). Pass sys.stdout for stdout output.
import logging, sys
logger = logging.getLogger("out")
handler = logging.StreamHandler(sys.stdout)
logger.addHandler(handler)
logger.warning("printed to stdout")All lessons in this course
- The logging Module Basics
- Handlers, Formatters, and Filters
- Structured Logging
- Debugging with pdb