Eli Bendersky <eli...@gmail.com> added the comment:

I can confirm Robert's findings. 

1) The documentation of C_RETURN and C_EXCEPTION indeed says None while the 
function object is passed. This is seen in the implementation of the C_TRACE 
macro in Python/ceval.c

2) The arg of RETURN can be indeed NULL when caused by an exception. This is 
seen in the PyEval_EvalFrameEx function of Python/ceval.c right after the 
'fast_yield' label.

3) The C/API documentation of Py_tracefunc shares the same errors with 
sys.settrace

As Georg said, the docs should be fixed to reflect the correct behavior.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue6798>
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