Michael Foord added the comment:

I'm not sure to what extent mock documentation should explain Python semantics. 
The docs *do* make clear that sentinel is useful for where you want to test 
(compare) objects by *identity*. Problems with copying and pickling them come 
from the fact that those operations don't preserve *identity*, which is a basic 
facet of *Python* and not down to mock/sentinel.

"sentinel provides a convenient way of creating and testing the identity of 
objects like this."

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<http://bugs.python.org/issue20804>
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