How can I tell where my python script is hanging?

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Let’s assume that you are running your program as:

python YOURSCRIPT.py

Try running your program as:

python -m trace --trace YOURSCRIPT.py

And have some patience while lots of stuff is printed on the screen. If you have an infinite loop, it will go on for-ever (halting problem). If it gets stuck somewhere, then mostly you are stuck on I/O or it is a deadlock.

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