Probably not quite what you're looking for, as I assume you're looking for a Modern C++ guide for Python developers, but surely the Boost Python source is worth

Probably not quite what you're looking for, as I assume you're looking for a Modern C++ guide for Python developers, but surely the Boost Python source is worth a look for good Modern C++ to interact with Python. Fair warning, the learning curve on understanding or using this library is more like a cliff than a curve. It is very heaving in TMP (Template Meta Programming). That said, if you can make sense of this, you can probably consider yourself a near expert in TMP.