我想将multiprocessing.Queue子类化,以实现抓取队列块的进程。唯一的问题是,我得到一个奇怪的TypeError?
#!/usr/bin/env python
#whaaaaa!?
from multiprocessing import Queue
class BufferQueue(Queue):
'''A thread/process safe queue for append/popleft operations with the import
buffer.'''
def __init__(self, **kwargs):
super(BufferQueue,self).__init__(**kwargs)
def consume(self, lim):
'''Consume up to but no more than lim elements and return them in a new
list, cleaning up the buffer.
@params
lim -- the maximum (limit) to consume from the list. If less items
exist in the list then that's fine too.
'''
lim = len(queue) if len(queue) < lim else lim
return [self.popleft() for i in range(lim)]
对此进行测试(我把它拆分出来,以便我不会拉其他任何东西)
| => ./tests/wtf_queue.py
Traceback (most recent call last):
File "./tests/wtf_queue.py", line 10, in <module>
class BufferQueue(Queue):
TypeError: method expected 2 arguments, got 3
编辑/更新:
答案 0 :(得分:10)
multiprocessing.Queue
是一种创建队列的方法,因此您应该将其用作函数my_queue = Queue()
。
>>> from multiprocessing import Queue
>>> type(Queue)
<class 'method'>
正如您所看到的,不是&#39;类型&#39;,您将用它来进行子类化。
如果您想实现自己的队列,可以查看queue.Queue
修改强>
如果要从多处理子类化队列,请改用multiprocessing.queues.Queue
,这是multiprocessing.Queue()