python-gevent模块（自动切换io的协程）

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import gevent     def foo():       print("Running in foo")     gevent.sleep(2)     print("Explicit context switch to foo again")     def bar():     print("Explicit context to bar")     gevent.sleep(1 )     print("Implicit context switch back to bar")   def func3():     print("running func3")     gevent.sleep(0)#遇到io就切换，sleep最长2秒，所以整个程序花费两秒，如果是串行需要花费3秒     print("running func3 again")   gevent.joinall([       gevent.spawn(foo),#启动一个协程     gevent.spawn(bar),     gevent.spawn(func3) ]   )