Python-greenlet完成多任务（代替yield），使用gevent完成多任务（协程）

 gevent 实现多任务：

import gevent

# 遇到延时就切换任务
def f1(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5) # 必须用自己的延时，不能用time模块的延时
def f2(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

def f3(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

g1 = gevent.spawn(f1, 5) # grenlet 对象
g2 = gevent.spawn(f2, 5)
g3 = gevent.spawn(f3, 5)
g1.join() # 堵塞，+ 延时，切换
g2.join()
g3.join()

　　结果：

D:python3.7python.exe E:/code_pycharm/test_in_class/tt13.py
<Greenlet "Greenlet-0" at 0x29a36a8: f1(5)> 0
<Greenlet "Greenlet-1" at 0x29a37b8: f2(5)> 0
<Greenlet "Greenlet-2" at 0x29a38c8: f3(5)> 0
<Greenlet "Greenlet-0" at 0x29a36a8: f1(5)> 1
<Greenlet "Greenlet-1" at 0x29a37b8: f2(5)> 1
<Greenlet "Greenlet-2" at 0x29a38c8: f3(5)> 1
<Greenlet "Greenlet-0" at 0x29a36a8: f1(5)> 2
<Greenlet "Greenlet-1" at 0x29a37b8: f2(5)> 2
<Greenlet "Greenlet-2" at 0x29a38c8: f3(5)> 2
<Greenlet "Greenlet-0" at 0x29a36a8: f1(5)> 3
<Greenlet "Greenlet-1" at 0x29a37b8: f2(5)> 3
<Greenlet "Greenlet-2" at 0x29a38c8: f3(5)> 3
<Greenlet "Greenlet-0" at 0x29a36a8: f1(5)> 4
<Greenlet "Greenlet-1" at 0x29a37b8: f2(5)> 4
<Greenlet "Greenlet-2" at 0x29a38c8: f3(5)> 4

Process finished with exit code 0

使用猴子补丁，可以不用把所有耗时的，阻塞的用gevent里的代替，该怎么写就怎么写。

如：time.sleep()的使用

import gevent
import time
from  gevent import monkey

monkey.patch_all()

# 遇到延时就切换任务
def f1(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        # gevent.sleep(0.5) # 必须用自己的延时，不能用time模块的延时
        time.sleep(0.5)
        
def f2(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

def f3(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

g1 = gevent.spawn(f1, 5) # grenlet 对象
g2 = gevent.spawn(f2, 5)
g3 = gevent.spawn(f3, 5)
g1.join() # 堵塞，+ 延时，切换
g2.join()
g3.join()

结果：

D:python3.7python.exe E:/code_pycharm/test_in_class/tt13.py
<Greenlet "Greenlet-0" at 0x3603268: f1(5)> 0
<Greenlet "Greenlet-1" at 0x3603598: f2(5)> 0
<Greenlet "Greenlet-2" at 0x3603488: f3(5)> 0
<Greenlet "Greenlet-0" at 0x3603268: f1(5)> 1
<Greenlet "Greenlet-1" at 0x3603598: f2(5)> 1
<Greenlet "Greenlet-2" at 0x3603488: f3(5)> 1
<Greenlet "Greenlet-0" at 0x3603268: f1(5)> 2
<Greenlet "Greenlet-1" at 0x3603598: f2(5)> 2
<Greenlet "Greenlet-2" at 0x3603488: f3(5)> 2
<Greenlet "Greenlet-0" at 0x3603268: f1(5)> 3
<Greenlet "Greenlet-1" at 0x3603598: f2(5)> 3
<Greenlet "Greenlet-2" at 0x3603488: f3(5)> 3
<Greenlet "Greenlet-0" at 0x3603268: f1(5)> 4
<Greenlet "Greenlet-1" at 0x3603598: f2(5)> 4
<Greenlet "Greenlet-2" at 0x3603488: f3(5)> 4

Process finished with exit code 0

用gevet.joinall 

import gevent
import time
from  gevent import monkey

monkey.patch_all()

# 遇到延时就切换任务
def f1(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        # gevent.sleep(0.5) # 必须用自己的延时，不能用time模块的延时
        time.sleep(0.5)

def f2(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

def f3(n):
    for i in range(n):
        print(gevent.getcurrent(), i)
        gevent.sleep(0.5)

gevent.joinall(
    gevent.spawn(f1, 5),
    gevent.spawn(f2, 5),
    gevent.spawn(f3, 5)

 )