This question raises an AssertionError on the second assert statement. Please change the code in a way that no AssertionError is thrown. Compare the values(weight property) of these objects. Bonus points for implementing a solution using duck typing.
class Dog(object):
    def __init__(self, weight):
        self.weight = weight

if __name__ == "__main__":  # Explain how this works
    pug = Dog(10)
    hound = Dog(50)
    rottweiler = Dog(50)
    assert pug != hound
    assert hound == rottweiler