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I don't think calling PyErr_Clear is necessary given the 
current implementation; both PyErr_Clear and 
PyErr_SetString ultimately call PyErr_Restore, which clears 
the old error.

As for passing the error through, that might be a better 
choice.  I put in the PyErr_SetString to try to follow the 
behavior of PyEval_EvalCodeEx when it gets non-string keys 
in a keyword dict.