python异步编程 报错:module 'asyncio' has no attribute 'coroutine'

调试代码如下：

# -*- coding:utf-8 -*-
import asyncio

@asyncio.coroutine
def wget(host):
    print('wget %s...' % host)
    content = asyncio.open_connection(host, 80)
    reader, writer = yield from connect
    header = 'GET / HTTP/1.0\r\nHost: %s\r\n\r\n' % host
    writer.write(header.encode('utf-8'))

    yield from writer.drain()
    while True:
        line = yield from reader.readline()
        if line == b'\r\n':
            break
        print('%s header > %s' % (host, line.decode('utf-8'.rstrip())))

    writer.close()

loop = asyncio.get_event_loop()
tasks = [wget(host) for host in ['www.sina.com', 'www.shu.com', 'www.163.com']]
loop.run_until_complete(asyncio.wait(tasks))
loop.close()

提示报错：

Traceback (most recent call last):
  File "asyncio.py", line 2, in <module>
    import asyncio
  File "/application/study/python/python3/asyncio.py", line 4, in <module>
    @asyncio.coroutine
AttributeError: module 'asyncio' has no attribute 'coroutine'

自己明明安装了asyncio库，还会报这个错，后来发现自己的文件名跟库名重复了，加载了当前的文件，所以就没有使用官方的库。那就改一下文件名就可以解决了