About getattr()

[MingyuanLuo]

In[1]: getattr(None, '') is None
Traceback (most recent call last):
  File "C:\Users\myluo\AppData\Local\Programs\Python\Python36\lib\site-packages\IPython\core\interactiveshell.py", line 3265, in run_code
    exec(code_obj, self.user_global_ns, self.user_ns)
  File "<ipython-input-8-dd6743d652c1>", line 1, in <module>
    getattr(None, '') is None
AttributeError: 'NoneType' object has no attribute ''

In[2]: getattr(None, '', None) is None
Out[2]: True

What's happend?