code: def get_connections(self, data=True):
          
          connections = []
          for a in self.get_agents(addr=False):
              c = (a.addr, a.get_connections(data=data))
              connections.append(c)
          return connections
docs: Return connections from all the agents in the environment.
  
          :param bool data:
              If ``True`` return also the dictionary associated with each
              connection
  
          :returns:
              A list of ``(addr, connections)``-tuples, where ``connections`` is
              a list of addresses agent in ``addr`` is connected to. If
              ``data`` parameter is ``True``, then the ``connections``
              list contains tuples of ``(nb_addr, data)``-pairs , where ``data``
              is a dictionary.
  
          :rtype: dict
  
          .. note::
  
              By design, potential manager agent is excluded from the returned
              list.