Python Debugging Cheat Sheet/Enable asyncio debug mode

Expose slow callbacks and event-loop issues.

Section: Async, Web, and Production Troubleshooting

Enable asyncio debug mode

bash
bash
PYTHONASYNCIODEBUG=1 python app.py

Learn the surrounding workflow

Compare similar commands or jump into common fixes when this command is part of a bigger troubleshooting path.

Related commands

Same sheet · prioritizing Async, Web, and Production Troubleshooting
Enable debug mode programmatically
Turn on event loop debugging in code.
OpenIn sheetpythonsame section
Start a simple HTTP server for quick testing
Serve files locally to reproduce client behavior.
OpenIn sheetbashsame section
Profile import time
See which imports are slowing startup.
OpenIn sheetbashsame section
Dump stack traces for all threads
Useful when an app appears hung or deadlocked.
OpenIn sheetpythonsame section
Insert a built-in breakpoint
Pause execution and enter the configured debugger.
Print the current exception traceback
Dump the active exception traceback in an except block.