Python可迭代队列 [英] Python iterable Queue
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问题描述
我需要知道队列何时关闭并且不会有更多项目,所以我可以结束迭代。
I need to know when a Queue is closed and wont have more items so I can end the iteration.
我是通过在队列中放置一个标记来实现的:
I did it by putting a sentinel in the queue:
from Queue import Queue
class IterableQueue(Queue):
_sentinel = object()
def __iter__(self):
return self
def close(self):
self.put(self._sentinel)
def next(self):
item = self.get()
if item is self._sentinel:
raise StopIteration
else:
return item
鉴于这是队列非常常见的用途,不存在任何内置实现?
Given that this is a very common use for a queue, isn't there any builtin implementation?
推荐答案
生成器是一种合理的方式,可以让生产者发送不再有队列任务的消息。
A sentinel is a reasonable way for a producer to send a message that no more queue tasks are forthcoming.
FWIW,您的代码可以通过 iter() :
FWIW, your code can be simplified quite a bit with the two argument form of iter():
from Queue import Queue
class IterableQueue(Queue):
_sentinel = object()
def __iter__(self):
return iter(self.get, self._sentinel)
def close(self):
self.put(self._sentinel)
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