【python】多线程

https://docs.python.org/2/library/multiprocessing.html

https://docs.python.org/2/library/threading.html

 http://www.coder4.com/archives/3352

import multiprocessing
import time
from time import sleep
import random

def func(msg):
    for i in xrange(3):
        print msg
        time.sleep(1)
class A:
    def __init__(self,i):
        sleep(int(random.random()*10))
        print i
        
class B:
    def __init__(self):
        pass
    def b(self):
        print __name__
        if __name__ == "__main__":
            pool = multiprocessing.Pool(processes=4)
            for i in xrange(10):
                msg = i
                pool.apply_async(A, (msg, ))
            pool.close()
            pool.join()
            print "Sub-process(es) done."
            
cb = B()
cb.b()

注意：if __name__ == "__main__": 必不可少

 

2.7版本对类方法的多线程支持不好，变通实现方案

import multiprocessing
import time
from time import sleep
import random

def func(msg):
    for i in xrange(3):
        print msg
        time.sleep(1)
class A():
    def __init__(self):
        print 'A'
    def a(self,i):
        sleep(int(random.random()*10))
        print i
        return 10+i
        
class C:
    def __init__(self,i):
        sleep(int(random.random()*10))
        print i
def multi(i):
    k=A()
    return k.a(i)
    
class B:
    def __init__(self):
        pass
    def b(self):
        print __name__
        #k = A()
        if __name__ == "__main__":
            pool = multiprocessing.Pool(processes=4)
            
            #k = C
            for i in xrange(10):
                z = pool.apply_async(multi,(i,))
                print z.get()
            pool.close()
            pool.join()
            print "Sub-process(es) done."
            
cb = B()
cb.b()

 http://pymotw.com/2/multiprocessing/