The document Embedding PyPy shows good examples, but did not tell how to deal with None value. As Python support None value, it might bring some troubles: 1. How to pass NULL from C to python for None? 2. If python function return None, how to handle the issue in C?
For the above cases, we observed errors like these: >From cffi callback <function add_numbersInt at 0x00007f25f313e110>: Trying to convert the result back to C: TypeError: expected integer, got NoneType object
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