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Python: Is there a way to get a local function variable from within a decorator that wraps it?
import sys

class persistent_locals(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

@persistent_locals
def func():
    local1 = 1
    local2 = 2

func()
print func.locals

def deco(func):
    class Wrapper(object):
        def __init__(self):
            self.foo = None
        def __call__(self, *args):
            print 'old foo:', self.foo
            result = func(*args)
            print 'new foo:', self.foo
            return result
    return Wrapper()

@deco
def my_func(new_foo):
    my_func.foo = new_foo

>>> my_func('test')
old foo: None
new foo: test
>>> my_func.foo
'test'
>>> my_func(42)
old foo: test
new foo: 42
>>> my_func.foo
42

def foo(x):
    y = x + 27
    return y

def myDecorator(f):
  def wrapper(*args, **kwargs):
    print('Arguments to this function %r / %r' % (args, kwargs))
    return f(*args, **kwargs)
  return wrapper