在Python中动态创建对象

Question

我为什么需要

class DummyObject(object):
    pass

为了要做

dummy = DummyObject()
dummy.foo = 42

为什么这在Python中不合法？

dummy = object()
dummy.foo = 42

这给出了错误:

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'object' object has no attribute 'foo'