【 python 】并发编程

• • 一、协程
  • • gevent

# coding:utf-8
import gevent
def f1():
    for i in range(5):
        print("func1-%s"%i)
        gevent.sleep(0.1)
def f2():
    for j in range(5):
        print("func2 -----%s"%j)
        gevent.sleep(0.2)
gevent.joinall([gevent.spawn(f1),gevent.spawn(f2)])

# coding:utf-8
import gevent,requests
from datetime import datetime

def func(url):
    print('%s  GET:%s' %(datetime.now(), url))
    resp = requests.get(url)
    t=datetime.now()
    l=len(resp.text)
    print('%s  %d bytes'% (t, l))

url1='https://www.python.org/'
url2='https://www.githubs.cn/'
g1=gevent.spawn(func,url1)
g2=gevent.spawn(func,url2)
gevent.joinall( [g1,g2])

# coding:utf-8
import gevent
from gevent.lock import Semaphore
sem = Semaphore(3)

def f1():
    for i in range(5):
        #sem.acquire()
        print('run f1-', i)
        #sem.release()
        gevent.sleep(1)

def f2():
    for i in range(5):
        sem.acquire()
        print('run f2----', i)
        sem.release()
        gevent.sleep(0.3)

t1 = gevent.spawn(f1)
t2 = gevent.spawn(f2)
gevent.joinall([t2,t1])