<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def consume(self):
 """Declare consumers."""

        head = self.consumers[:-1]
        tail = self.consumers[-1]
        [self._declare_consumer(consumer, nowait=True)
                for consumer in head]
        self._declare_consumer(tail, nowait=False)