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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def _run_no_wait_ops(state):
    '''
    Run all ops for all servers at once.
    '''

    hosts_operations = product(state.inventory, state.get_op_order())
    with progress_spinner(hosts_operations) as progress:
        # Spawn greenlet for each host to run *all* ops
        greenlets = [
            state.pool.spawn(
                _run_server_ops, state, host,
                progress=progress,
            )
            for host in state.inventory
        ]
        gevent.joinall(greenlets)