Python 高级编程和异步IO并发编程 --13

# asyncio 没有提供http协议的接口
import asyncio
import time
from urllib.parse import urlparseasync def get_url(url):url = urlparse(url)host = url.netlocpath = url.pathif path == '':path = '/'# 建立连接# asyncio.open_connection是一个协程reader, writer = await asyncio.open_connection(host, 80)writer.write("GET {} HTTP/1.1\r\nHost:{}\r\nConnection:close\r\n\r\n".format(path, host).encode('utf-8'))all_lines = []async for raw_line in reader:line = raw_line.decode('utf-8')all_lines.append(line)html = '\n'.join(all_lines)return htmlasync def main():tasks = []for url in range(1, 21):url = 'http://shop.projectsedu.com/goods/{}/'.format(url)tasks.append(asyncio.ensure_future(get_url(url)))for task in asyncio.as_completed(tasks):# asyncio.as_completed返回的是一个协程result = await taskprint(result)if __name__ == '__main__':start_time = time.time()loop = asyncio.get_event_loop()loop.run_until_complete(main())print('last time:{}'.format(time.time() - start_time))

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