What cool hacks can be done using sys.settrace?

Question

I love being able to modify the arguments the get sent to a function, using settrace, like :

import sys

def trace_func(frame,event,arg):
    va         


        

Answer 1

The python debugger Pdb uses sys.settrace to analyse lines to debug.

Here's an c optimization/extension for pdb that also uses sys.settrace

https://bitbucket.org/jagguli/cpdb