Printing stack trace after a keypress in Python

Asked Oct 22 '16 at 10:06

Active Oct 22 '16 at 10:06

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I have a complex script which does I/O, lots of data processing, communication with external web services, etc.

In some rare cases the script 'hangs'. The CPU is at full 100% load all the time.

I would like to be able to debug the script and find the loop where is 'hangs'. But because it takes 2-3 hours before that loop is reached, I had another idea - print the full stack trace when I press a special key.

Is there a way to attach a keypress event to the script and then I press the right key, then the full stack trace (including where the script was before the keypress) would be printed?

Or maybe there is another solution?

asked Oct 22 '16 at 10:06

ddofborg

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I think logging would work better. – Stop harming Monica Oct 22 '16 at 10:39
That is not the question :) Logging is there, but is not enough. – ddofborg Oct 22 '16 at 14:11
I found an answer in http://stackoverflow.com/questions/132058/showing-the-stack-trace-from-a-running-python-application. So far it works :) – ddofborg Oct 22 '16 at 14:15
By logging you can have have a complete stacktrace and more. And logging is more robust that signal handling --a busy process might be unable to run the callback. But tbh I didn't even think of using low level signals. – Stop harming Monica Oct 22 '16 at 18:38
You can also trigger a stack trace in the code, just before you start the loop (related) code. – boardrider Oct 23 '16 at 11:18

Printing stack trace after a keypress in Python

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