import asyncio @asyncio.coroutine def wget(host): print('wget %s...' % host) connect = 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())) # Ignore the body, close the socket writer.close() loop = asyncio.get_event_loop() tasks = [wget(host) for host in ['www.sina.com.cn', 'www.sohu.com', 'www.163.com']] loop.run_until_complete(asyncio.wait(tasks)) loop.close() 执行结果如下: wget www.sohu.com... wget www.sina.com.cn... wget www.163.com... (等待一段时间) (打印出sohu的header) www.sohu.com header > HTTP/1.1 200 OK www.sohu.com header > Content-Type: text/html ... (打印出sina的header) www.sina.com.cn header > HTTP/1.1 200 OK www.sina.com.cn header > Date: Wed, 20 May 2015 04:56:33 GMT ... (打印出163的header) www.163.com header > HTTP/1.0 302 Moved Temporarily www.163.com header > Server: Cdn Cache Server V2.0 ...
如果不使用异步IO而改用函数调用,那么该程序执行时间将会是三倍的(等待一段时间)
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如果不使用异步IO而改用函数调用,那么该程序执行时间将会是三倍的(等待一段时间)