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PyIter_Next has ambiguous return value  #105201

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@iritkatriel

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@iritkatriel

As discussed in capi-workgroup/problems#1, we have some C API functions that have ambiguous return values, requiring the caller to query PyErr_Occurred() to find out whether there was an error.

We will try to move away from those APIs to alternative ones whose return values non-ambiguously indicate whether there has been an error, without requiring the user to call PyErr_Occurred().

In this issue we will discuss the iterator API. PyIter_Next return NULL for both error and for the iterator being exhausted. PyErr_Occurred() distinguishes between the cases.

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