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When a script ends with an error during debugging, PyCharm got disconnected from pydev. So, the state of variable at the moment of the error remains unknown.

How can I find out the very latest values of variables right before the error happens?

Updated: This problem arises only when you try to debug a unit test. You have to check "Activation policy: On raise" for "All Breakpoints" in the list of breakpoints.

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    to the best of my knowledge, pycharm does not use pydev. So it's hard to get a lock on what your issue is. Secondly, look into try/catch structures. Third, are you sure you want to do print debugging, as opposed to use a nice debugger itself? Commented Aug 24, 2014 at 16:53
  • @inspectorG4dget I run PyCharm's debugger (and it says "Connected to pydev debugger (build 135.1057) pydev debugger: process 28034 is connecting"). Commented Aug 24, 2014 at 17:14

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The simplest solution would be setting a breakpoint just before/at the wanted line so you can see the variables just before the exception is called.

It's also possible to set an "exception breakpoint". This stops the script when a specific exception is encountered. Open "Run" > "View Breakpoints", click on the "+" sign and add a "Python Exception Breakpoint". Now you have to choose a specific exception.

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In this case, you delete the previous breakpoint and add an "exception breakpoint". Open Run > View Breakpoints, click on the "+" sign and add a "Python Exception Breakpoint". Now you have to choose a specific exception. That's it.
That's it. Thanks a lot. Maybe worth adding to the post itself.

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