Fix mysterious undetected error -- call to non-existant Py_Err_SetStr() which shoulda coulda woulda oughta been PyErr_SetString().
Fix mysterious undetected error -- call to non-existant Py_Err_SetStr()
which shoulda coulda woulda oughta been PyErr_SetString().

sk-/python2.7-type-annotator,sk-/python2.7-type-annotator,sk-/python2.7-type-annotator