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- """
- 异步I/O操作 - asyncio模块
- Version: 0.1
- Author: 骆昊
- Date: 2018-03-21
- """
- import asyncio
- async def wget(host):
- print('wget %s...' % host)
- connect = asyncio.open_connection(host, 80)
- # 异步方式等待连接结果
- reader, writer = await connect
- header = 'GET / HTTP/1.0\r\nHost: %s\r\n\r\n' % host
- writer.write(header.encode('utf-8'))
- # 异步I/O方式执行写操作
- await writer.drain()
- while True:
- # 异步I/O方式执行读操作
- line = await 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()
- # 通过生成式语法创建一个装了三个协程的列表
- hosts_list = ['www.sina.com.cn', 'www.sohu.com', 'www.163.com']
- tasks = [wget(host) for host in hosts_list]
- # 下面的方法将异步I/O操作放入EventLoop直到执行完毕
- loop.run_until_complete(asyncio.wait(tasks))
- loop.close()
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