def is_empty(self): return self._size == 0 def first(self): if self.is_empty(): raise Empty('Queue is empty') return self._data[self._front] def dequeue(self): if self.is_empty(): raise Empty('Queue is empty') temp = self._data[self._front] self._front = (self._front ...
1 >>> import queue 2 >>> q = queue.Queue() 3 >>> q.put(100) 4 >>> q.get() 5 100 6 >>> q.get(True,2) 7 Traceback (most recent call last): 8 File "<stdin>", line 1, in <module> 9 File "E:\Python37-32\lib\queue.py", line 178, in get 10 raise Empty 11 _...
self.front = self.front.nextself.size -=1returntempdefis_empty(self):ifself.size ==0:returnFalseelse:returnTruedeftop(self):ifself.size ==0:raiseLookupError('queue is empty')else:returnself.front.valuedefsize(self):returnself.sizedef__str__(self):ifself.size ==0:returnNoneelse: stack...
>>> import queue>>> q = queue.Queue()>>> q.put(100)>>> q.get()100>>> q.get(True,2)Traceback (most recent call last): File "<stdin>", line 1, in <module> File "E:\Python37-32\lib\queue.py", line 178, in get raise Empty_queue.Empty # 2 秒钟内没有任务可获取则引发...
1>>>importqueue2>>> q =queue.Queue()3>>> q.put(100)4>>>q.get()51006>>> q.get(False,2)7Traceback (most recent call last):8File"<stdin>", line 1,in<module>9File"E:\Python37-32\lib\queue.py", line 167,inget10raiseEmpty11_queue.Empty12#指定为非阻塞模式,队列为空则立即引...
>>> import queue>>> q = queue.Queue()>>> q.put(100)>>> q.get()100>>> q.get(False,2)Traceback (most recent call last):File "<stdin>", line 1, in <module>File "E:\Python37-32\lib\queue.py", line 167, in getraise Empty_queue.Empty# 指定为非阻塞模式,队列为空则立即引发...
raise Full # 等待期间一直没空间,抛出 Full 异常 self.not_full.wait(remaining) self._put(item) # 往底层数据结构中加入一个元素 self.unfinished_tasks += 1 self.not_empty.notify() def _put(self, item): self.queue.append(item) 尽管只有二十几行的代码,但这里的逻辑还是比较复杂的。它要处理超时...
self.queue.append(ele) self.rear=self.rear+1 def dequeue(self): #出队操作 if self.isempty: raise exception("queue is empty") else: self.front=self.front+1 return self.queue[self.front] def isfull(self): return self.rear-self.front+1==self.size ...
raise Full# 等待期间一直没空间,抛出 Full 异常 self.not_full.wait(remaining) self._put(item)# 往底层数据结构中加入一个元素 self.unfinished_tasks +=1 self.not_empty.notify() def_put(self, item): self.queue.append(item) 尽管只有二十几行的代码,但这...
self.size-=1returnitemelse:raiseIndexError("dequeue from empty circular queue")defpeek(self):ifnot self.is_empty():returnself.items[self.head]else:raiseIndexError("peek from empty circular queue")defsize(self):returnself.size 代码解释:上述代码定义了一个循环队列类CircularQueue,它使用数组来存储...