# side_effect will make mock method can be runable  
# this can be use to reutrn_value in different arguments
>>> mock_method = mock.Mock()  
>>> mock_method.side_effect = lambda x: x + 1  
>>> mock_method(1)
2
>>> mock_method(2)
3

# Using PropertyMock with return_value argument  

>>> with mock.patch('package.module.attribute',  
                     new_callable=mock.PropertyMock(return_value=3))
                     as mock_attribute:  
>>>       print(mock_attribte)  
>>>       print(package.module.attribute)  
3  
3