def raise_self_signed(certificate):

    message = 'Server certificate verification failed - certificate is self-signed'
    raise TLSVerificationError(message, certificate)
handle root, if node has no predecessor, graph root becomes
dataset/ETHPy150Open wbond/oscrypto/oscrypto/_tls.py/raise_self_signed--crossover with--dataset/ETHPy150Open kakwa/pygraph_redis/pygraph_redis/directed_graph.py/Directed_graph._handle_no_predecessor_legacy