Martin v. Löwis <mar...@v.loewis.de> added the comment:

I find it quite clear. "failure" not only means that no item was found, but 
also that the operation failed, i.e. raised an exception. In general, a NULL 
pointer returned from a function that returns PyObject* *always* means that 
there is an exception. There is no need to repeat that every time.

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nosy: +loewis

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<http://bugs.python.org/issue10057>
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