Parallel request handler for Python 3.x

import threading
import queue


class MultiRequest:
    DEFAULT_NUM_THREADS = 4

    def __init__(self, handler, num_threads=DEFAULT_NUM_THREADS):
        self.num_threads = num_threads
        self.threads = []
        self.queue = queue.Queue()
        self.handler = handler


    def get(self, requests):
        if not self.threads:
            t = threading.Thread(target=self.run)
            t.daemon = True
            t.start()
            self.threads.append(t)

        for r in requests:
            self.queue.put(r)


    def run(self):
        '''called in a thread to process requests by calling the handler'''
        while 1:
            url = self.queue.get()
            self.handler(url)