class C1:
    def __del__(self):
        1/0

class C2:
    def __del__(self):
        try:
            1/0
        except:
            raise

def func(cls):
    x = cls()
    try:
        try:
            x.x
        except AttributeError:
            del x
            raise TypeError
    except Exception as e:
        print((e, e.__context__))

func(C1) # Context is OK
func(C2) # Context is lost