'For each agent, get an observation of the last action each of the
other agents took. Then take an action yourself.'

def parley(self):

    acts = self.acts
    for (index, agent) in enumerate(self.agents):
        acts[index] = agent.act()
        for other_agent in self.agents:
            if (other_agent != agent):
                other_agent.observe(validate(acts[index]))
