finalizer2.py

class Message:
    def __init__(self):
        self._exception = None

    def __del__(self):
        print("running after object number %d was allocated" % i)


def f():
    raise RuntimeError("test")


def g():
    m = Message()
    d = {"a": m}  # putting something else on the stack with a reference to m
    try:
        f()
    except Exception as e:
        m._exception = e

i = 0
g()
os = []
for i in range(1000):
    os.append({"a%d" % i: i})