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I solved the problem by brute force: uninstall Sage-10.2 and install a new version Sage-10.2.app. Using also the recommended surplus package now gives the choice in the JupiterLab (button RHS above) to choose between different kernels, a Python3 kernel.. and a Sage-10.2 kernel :)

Thanks to Eric for the hint that I run the false kernel to use Sage.