Python greenlet和gevent使用代码示例解析

from greenlet import greenlet

def test1(x,y):
  z = gr2.switch(x+y)
  print(z)

def test2(u):
  print(u)
  gr1.switch(42)

gr1 = greenlet(test1)
gr2 = greenlet(test2)
gr1.switch("hello",'world')

from greenlet import greenlet

def eat(name):
  print('%s eat 1' %name)
  g2.switch('egon')
  print('%s eat 2' %name)
  g2.switch()
def play(name):
  print('%s play 1' %name)
  g1.switch()
  print('%s play 2' %name)

g1=greenlet(eat)
g2=greenlet(play)

g1.switch('egon')#可以在第一次switch时传入参数，以后都不需要

import gevent

def func1():
  print("start func1")
  gevent.sleep(1)
  print("end func1")

def func2():
   print("start func2")
  gevent.sleep(1)
  print("end func2")

gevent.joinall(
  [
    gevent.spawn(func1),
    gevent.spawn(func2)
  ]
)

```python
from gevent import monkey;monkey.patch_all()

import gevent
import time
def eat():
  print('eat food 1')
  time.sleep(2) # 会自动的跳转到play
  print('eat food 2')

def play():
  print('play 1')
  time.sleep(1) # 会自动的跳转到eat
  print('play 2')

g1=gevent.spawn(eat)
g2=gevent.spawn(play)
gevent.joinall([g1,g2])
print('end')

from gevent import monkey; monkey.patch_all()
import gevent
import requests

def f(url):
  print('GET: %s' % url)
  resp = requests.get(url)
  data = resp.text
  print('%d bytes received from %s.' % (len(data), url))

gevent.joinall([
    gevent.spawn(f, 'https://www.python.org/'),
    gevent.spawn(f, 'https://www.yahoo.com/'),
    gevent.spawn(f, 'https://github.com/'),
    gevent.spawn(f, 'https://github.com/'),
    gevent.spawn(f, 'https://github.com/'),
    gevent.spawn(f, 'https://github.com/'),
    gevent.spawn(f, 'https://github.com/'),
])

import gevent
from gevent import socket

urls = ['www.baidu.com', 'www.163.com', 'www.qq.com']
jobs = [gevent.spawn(socket.gethostbyname, url) for url in urls]
gevent.joinall(jobs, timeout=2)

print([job.value for job in jobs])
或使用patch_socket()
from gevent import monkey; monkey.patch_socket()
import gevent

def f(n):
  for i in range(n):
    print(gevent.getcurrent(), i)
    gevent.sleep(0) # 不加的话不会交替执行
g1 = gevent.spawn(f, 5)
g2 = gevent.spawn(f, 5)
g3 = gevent.spawn(f, 5)
g1.join()
g2.join()
g3.join()

import gevent
from gevent.queue import Queue


def func():
  for i in range(10):
    print("int the func")
    q.put(f"test{i}")
    gevent.sleep(0)

def func2():
  for i in range(10):
    print("int the func2")
    res = q.get()
    print("--->",res)

q = Queue()
gevent.joinall(
  [
    gevent.spawn(func2),
    gevent.spawn(func),
  ]
)