Message 314194 - Python tracker

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Thinking about PySys_AddWarnOptionUnicode a little further, I'm not sure we actually need to change anything in the implementation there - I think we can just make it clearer in the docs that *only* PySys_AddWarnOption is supported prior to Py_Initialize for the embedding use case - the unicode version of the API currently only makes sense in CPython, where we can call it after _Py_InitializeCore.

It will make sense for embedding applications in 3.8 once we make Py_InitializeCore a public API.