pdb has been, is and probably always will be the bread and butter of Python programmers, when they need to find the root cause of a problem in their applications, as it’s a built-in and easy to use debugger. But there are cases, when pdb can’t help you, e.g. if your app has got stuck somewhere, and you need to attach to a running process to find out why, without restarting it. This is where gdb shines.
http://podoliaka.org/2016/04/10/debugging-cpython-gdb/
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