模拟多线程运行

from gevent import monkey
monkey.patch_all()
import gevent
def foo():
    print('Running in foo')
    gevent.sleep(0)
    print('Explicit context switch to foo again')
def bar():
    print('Explicit context to bar')
    gevent.sleep(0)    
    print('Implicit context switch back to bar')
gevent.joinall([
    gevent.spawn(foo),
    gevent.spawn(bar),
])