raise.py

import weakref

def inner():
    raise RuntimeError()

def outer(obj):
    try:
        inner()
    except RuntimeError as e:
        n = RuntimeError()
        raise n

def entry(obj):
    try:
        outer(obj)
    except RuntimeError:
        return True
    return False

class MyObject(object):
    pass

def test():
    my_object = MyObject()
    weak = weakref.ref(my_object)
    assert entry(my_object)
    my_object = None # Should cause the object to be collected
    assert weak() is None

if __name__ == '__main__':
    test()