多处理队列子类问题

Question

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)]

测试这个(我将其拆分,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:

Answer 1

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"类型",您将使用它来进行子类化.

如果要实现自己的队列,可以查看queue.Queue

编辑:

如果要从多处理中对队列进行子类化,请multiprocessing.queues.Queue改为使用,这是返回的对象的类型multiprocessing.Queue()