Debug the code even in case of error PyDev

Question

I'm using the PyDev module for Eclipse debugger and I'm not able to debug my code to find out what's the reason of compilation failure! How to debug a code even if there is an error? for example this kind of error

a = 41
b = 'str'
print a + b 

Edit: The question is not about the code

Answer 1

if you in interactive console try

preferences->pydev->interactive console and flag "connect console to a debug session"

Answer 2

you can not conncat int and str:

see this doc pydev debugger