Enable warnings that may help reveal bad behavior.
Section: Tracebacks and Exceptions
Show default warnings
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bash
python -Wd app.pyLearn the surrounding workflow
Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.
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Same sheet · prioritizing Tracebacks and Exceptions
Print the current exception traceback
Dump the active exception traceback in an except block.
Run in Python development mode
Enable extra runtime checks and debug-friendly behavior.
Format exception as a string
Capture traceback output for logs or APIs.
Get exception info tuple
Access exception type, value, and traceback explicitly.
Preserve context with raise from
Chain exceptions to keep original failure context.
Enable faulthandler
Print Python tracebacks on fatal errors like segfaults.