# multi-processes
from multiprocessing import Process, Queue
class Worker(object):
    def __init__(self, queue):
        self.queue = queue
        self.process_num = 10 <------------ 10 processes
        self.count = 0

    def start(self):
        for i in range(self.process_num):
            p = Process(target = self.run)
            p.start()
            p.join()

    def run(self):
        while True:
            self.count += 1
            user = self.queue.get()
            # do something not so fast like time.sleep(1)
            print self.count
            if self.queue.empty():
                break

def start(self):
    for i in range(self.process_num):
        p = Process(target = self.run)
        p.start()                       <-- starts a new process
        p.join()                        <-- waits for the process to terminate