In [1]: a = {'name': 'wang'} 
 
In [2]: a.get('age') 
 
In [3]: a['age'] 
---------------------------------------------------------------------------
KeyError                 Traceback (most recent call last) 
<ipython-input-3-a620cb7b172a> in <module>() 
----> 1 a['age'] 
 
KeyError: 'age'
 
In [4]: a.get('age', 10) 
Out[4]: 10 

In [6]: type(a.get('age')) 
Out[6]: NoneType