关于python：python3错误，无法导入名称’SimpleQueue’

python3 error, cannot import name 'SimpleQueue'

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#!/usr/bin/env python3

import logging; logging.basicConfig(level=logging.INFO)

import asyncio, os, json, time
from datetime import datetime

from aiohttp import web

def index(request):
return web.Response(body=b'Awesome')

@asyncio.coroutine
def init(loop):
app = web.Application(loop=loop)
app.router.add_route('GET', '/', index)
srv = yield from loop.create_server(app.make_handler(), '127.0.0.1', 9000)
logging.info('server started at http://127.0.0.1:9000...')
return srv

loop = asyncio.get_event_loop()
loop.run_until_complete(init(loop))
loop.run_forever()

Process (28411) start...
I (28411) just created a child process (28412).
I am child process (28412) and my parent is 28411.
Traceback (most recent call last):
File"webApp.py", line 5, in
import asyncio, os, json, time
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/asyncio/init.py", line 21, in
Traceback (most recent call last):
File"webApp.py", line 5, in
import asyncio, os, json, time
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/asyncio/init.py", line 21, in
from .base_events import *
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/asyncio/base_events.py", line 18, in
from .base_events import *
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/asyncio/base_events.py", line 18, in
import concurrent.futures
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/concurrent/futures/init.py", line 17, in
import concurrent.futures
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/concurrent/futures/init.py", line 17, in
from concurrent.futures.process import ProcessPoolExecutor
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/concurrent/futures/process.py", line 54, in
from concurrent.futures.process import ProcessPoolExecutor
File"/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/concurrent/futures/process.py", line 54, in
from multiprocessing import SimpleQueue
from multiprocessing import SimpleQueue
ImportError: cannot import name 'SimpleQueue'
ImportError: cannot import name 'SimpleQueue'