Method set

include/pybind11/pytypes.h:1182–1187

    template <typename IdxType, detail::enable_if_t<std::is_integral<IdxType>::value, int> = 0>
    static void set(handle obj, const IdxType &index, handle val) {
        // PySequence_SetItem does not steal a reference to 'val'
        if (PySequence_SetItem(obj.ptr(), ssize_t_cast(index), val.ptr()) != 0) {
            throw error_already_set();
        }
    }
};

struct list_item {