from urllib import request import gevent,time from gevent import monkey monkey.patch_all() #把当前程序的所有的io操作给我单独的做上标记 def f(url):     print('GET: %s' % url)     resp = request.urlopen(url)     data = resp.read()     print('%d bytes received from %s.' % (len(data), url)) urls = ['https://www.python.org/',         'https://www.yahoo.com/',         'https://github.com/' ] time_start = time.time() for url in urls:     f(url) print("同步cost",time.time() - time_start) async_time_start = time.time() gevent.joinall([     gevent.spawn(f, 'https://www.python.org/'),     gevent.spawn(f, 'https://www.yahoo.com/'),     gevent.spawn(f, 'https://github.com/'), ]) print("异步cost",time.time() - async_time_start)

GET: https://www.python.org/

50114 bytes received from https://www.python.org/.

GET: https://www.yahoo.com/

505000 bytes received from https://www.yahoo.com/.

GET: https://github.com/

65396 bytes received from https://github.com/.

同步cost 3.5022003650665283

GET: https://www.python.org/

GET: https://www.yahoo.com/

GET: https://github.com/

65396 bytes received from https://github.com/.

50114 bytes received from https://www.python.org/.

504996 bytes received from https://www.yahoo.com/.

异步cost 1.332076072692871