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bpo-40225: Don't raise an exception on normal return from generator. #19473

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Merged
markshannon merged 1 commit into from
Jun 4, 2020
Merged

bpo-40225: Don't raise an exception on normal return from generator. #19473

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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/Core and Builtins/2020-04-11-13-07-49.bpo-4022.Ctpn_F.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
Improve performance of generators by not raising internal StopIteration.
3 changes: 2 additions & 1 deletion Objects/genobject.c
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Expand Up @@ -231,7 +231,8 @@ gen_send_ex(PyGenObject *gen, PyObject *arg, int exc, int closing)
if (PyAsyncGen_CheckExact(gen)) {
PyErr_SetNone(PyExc_StopAsyncIteration);
}
else {
else if (arg) {
/* Set exception if not called by gen_iternext() */
PyErr_SetNone(PyExc_StopIteration);
}
}
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