def _iter_choices(choices):
    if choices is not None:
        for choice in choices:
            if not isinstance(choice, tuple):
                choice = (choice, choice)
            yield choice
Used by TLSBox to initiate the SSL handshake.
dataset/ETHPy150Open mitsuhiko/fungiform/fungiform/widgets.py/_iter_choices--crossover with--dataset/ETHPy150Open nlloyd/SubliminalCollaborator/libs/twisted/protocols/amp.py/BinaryBoxProtocol._startTLS