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# lets say we have some channels like chTargetReached, chAwaitingOrdersclass Actor:  def __init__(self):    self.currentCh = chAwaitingOrders    self.currentHndl = self.gotOrder      def run(self):    while True:      val = self.currentCh.receive()      currentHndl(val)          def gotOrder(self, val):    # according to val we change currentCh    if val == "GOTO_TARGET":      self.currentCh = chTargetReached      self.currentHndl = self.targetReached  def targetReached(self, val):    pass