Method Cleanup

python/common/PyUtil.cpp:33–43

{
public:
    Cleanup()
    {
        NVCV_ASSERT(m_instance == nullptr && "Only one instance of Cleanup can be instantiated");
        m_instance = this;

        // Functions registered with python's atexit will be executed after
        // the script ends without fatal errors, but before python interpreter is torn down.
        // That's a good place for our cleanup.
        auto py_atexit = py::module_::import("atexit");
        py_atexit.attr("register")(py::cpp_function(&doCleanup));
    }

    ~Cleanup()
    {