python
import logging
logger = logging.getLogger(__name__)Python Logging and Tracing Cheat Sheet
Reference for Python logging, stack traces, warning visibility, trace hooks, and instrumentation patterns.
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Logging Core Patterns
python
import logging
logging.basicConfig(filename='app.log', level=logging.DEBUG)Include stack info in a log call
Attach the current stack to a log message.
pythonANYloggingstacktrace
python
logger.warning("Unexpected state", stack_info=True)python
try:
risky_call()
except Exception:
logger.error("Failure", exc_info=True)Warnings and Execution Traces
python
import warnings
warnings.simplefilter('default')bash
python -W error app.pybash
python -m trace --trace app.pybash
python -m trace --count app.pySignals and Crash Diagnostics
Dump traceback later with faulthandler
Emit stack traces after a timeout to catch hangs.
pythonANYfaulthandlerhangs
python
import faulthandler
import sys
faulthandler.dump_traceback_later(30, repeat=True, file=sys.stderr)python
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