gevent支持的協程

Gevent 是一個第三方庫，可以輕鬆通過gevent實現併發同步或非同步編程，在gevent中用到的主要模式是Greenlet, 它是以C擴展模塊形式接入Python的輕量級協程。 Greenlet全部運行在主程式操作系統進程的內部，但它們被協作式地調度。

 1 import gevent
 2 
 3 def foo():
 4     print('Running in foo')
 5     gevent.sleep(1)
 6     print('Explicit context switch to foo again')
 7 
 8 def bar():
 9     print('Explicit context to bar')
10     gevent.sleep(2)
11     print('Implicit context switch to bar again')
12 gevent.joinall([
13     gevent.spawn(foo),
14     gevent.spawn(bar),
15 ])

 1 from gevent import monkey;
 2 
 3 monkey.patch_all()
 4 from urllib.request import urlopen
 5 import time
 6 
 7 def f(url):
 8     print('GET: %s' % url)
 9     resp = urlopen(url)
10     data = resp.read()
11     print('%d bytes received from %s.' % (len(data), url))
12 
13 #l=['https://www.python.org/','https://www.baidu.com/','https://github.com/']
14 start=time.time()
15 # for url in l:
16 #     f(url)
17 
18 gevent.joinall([
19     gevent.spawn(f, 'https://www.python.org/'),
20     gevent.spawn(f, 'https://www.baidu.com/'),
21     gevent.spawn(f, 'https://github.com/'),
22 ])
23 
24 end=time.time()
25 print(end-start)