Yolanda added the comment: diff --git a/Lib/unittest/mock.py b/Lib/unittest/mock.py index 7400fb7..9e47cd2 100644 --- a/Lib/unittest/mock.py +++ b/Lib/unittest/mock.py @@ -991,7 +991,10 @@ class CallableMixin(Base): raise effect if not _callable(effect): - result = next(effect) + try: + result = next(effect) + except StopIteration: + result = None if _is_exception(result): raise result if result is DEFAULT:
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