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Please note that the present is a fork of the recipe 577283 "Decorator to expose local variables of a function after execution" of Pietro Berkes, available at http://code.activestate.com/recipes/577283-decorator-to-expose-local-variables-of-a-function-/ , and aiming only to report the alternative implementation "persistent_locals2", whose I'm co-author with Pietro Berkes, and which was submitted together to the original recipe. Refer to the latter for an exhaustive description and discussion.

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#This is fork of the recipe 577283 "Decorator to expose local variables of a function after execution"
#available at http://code.activestate.com/recipes/577283-decorator-to-expose-local-variables-of-a-function-/.
class persistent_locals2(object):
    def __init__(self, func):
        self._locals = {}
        self.func = func

    def __call__(self, *args, **kwargs):
        def tracer(frame, event, arg):
            if event=='return':
                self._locals = frame.f_locals.copy()

        # tracer is activated on next call, return or exception
        sys.setprofile(tracer)
        try:
            # trace the function call
            res = self.func(*args, **kwargs)
        finally:
            # disable tracer and replace with old one
            sys.setprofile(None)
        return res

    def clear_locals(self):
        self._locals = {}

    @property
    def locals(self):
        return self._locals
Created by Andrea Maffezzoli on Wed, 7 Jul 2010 (GPL3)
Python recipes (4591)
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  • Licensed under the GPL 3
  • Viewed 3884 times
  • Revision 6 (updated 11 years ago)