python：協程

1，如何實如今兩個函數之間的切換？

def func1():
    print(l)
    yield
    print(3)
    yield
def func2():
    g =func1()
    next(g)
    print(2)
    next(g)
    print(4)
func2()

2,協程

import time
from greenlet import greenlet   # 在單線程中切換狀態的模塊
def eat1():
    print('吃雞腿1')
    g2.switch()
    time.sleep(5)
    print('吃雞翅2')
    g2.switch()

def eat2():
    print('吃餃子1')
    g1.switch()
    time.sleep(3)
    print('白切雞')

g1 = greenlet(eat1)
g2 = greenlet(eat2)
g1.switch()

3，gevent

from gevent import monkey;monkey.patch_all()
import time     # time socket urllib requests
import gevent   # greenlet gevent在切換程序的基礎上又實現了規避IO
from threading import current_thread
def func1():
    print(current_thread().name)
    print(123)
    time.sleep(1)
    print(456)

def func2():
    print(current_thread().name)   # dummythread
    print('hahaha')
    time.sleep(1)
    print('10jq')

g1 = gevent.spawn(func1)  # 碰見他認識的io會自動切換的模塊
g2 = gevent.spawn(func2)
gevent.joinall([g1,g2])

4，效率對比

from gevent import monkey;monkey.patch_all()
import time     # time socket urllib requests
import gevent   # greenlet gevent在切換程序的基礎上又實現了規避IO

def task(args):
    time.sleep(1)
    print(args)

def sync_func():   # 同步
    for i in range(10):
        task(i)

def async_func(): # 異步
    g_l = []
    for i in range(10):
        g_l.append(gevent.spawn(task,i))   # 給寫成任務傳參數
    gevent.joinall(g_l)

start = time.time()
sync_func()
print(time.time() - start)

start = time.time()
async_func()
print(time.time() - start)