import gc
thingy = object()
class A(object):
def f(self):
return 1
x = thingy
r = gc.get_referrers(thingy)
if "__module__" in r[0]:
dct = r[0]
else:
dct = r[1]
a = A()
for i in range(10):
a.f()
dct["f"] = lambda self: 2
print(a.f()) # should print 1