def dunder_partition(key):
    parts = key.rsplit('__', 1)
    return tuple(parts) if len(parts) > 1 else (parts[0], None)
Callback that the tunnel is working
dataset/ETHPy150Open naiquevin/lookupy/lookupy/dunderkey.py/dunder_partition--crossover with--dataset/ETHPy150Open EricssonResearch/calvin-base/calvin/runtime/north/calvincontrol.py/CalvinControlTunnelClient.tunnel_up