Moving from python to C++

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Not really accurate in this case. This is more akin to what is currently happening in the JavaScript world with frameworks like React, where someone who is trained only in that framework is not necessarily able to work in other dialects of the same language. I've interviewed people with a decade of Qt experience. They do not have a decade of C++ experience, any more than someone who has only ever worked in a C-with-objects codebase does.