带参数的Python子类化过程

Question

我正在尝试创建一个对象,但作为一个新进程.我正在按照本指南编写并提供此代码.

import multiprocessing as mp 
import time

class My_class(mp.Process):
    def run(self):
        print self.name, "created"
        time.sleep(10)
        print self.name, "exiting"
        self.x()

    def x(self):
        print self.name, "X"

if __name__ == '__main__':
    print 'main started'
    p1=My_class()
    p2=My_class()
    p1.start()
    p2.start()  
    print 'main exited'

但是在这里我无法将参数传递给对象.我搜索但没有找到.它不像普通的多进程,我们会做类似的事情:

p1 = multiprocessing.Process(target=My_class, args=('p1',10,))

将参数传递给新进程.但是类实例的多处理是不同的.现在,我正在以下面的方式传递它.

import multiprocessing as mp 
import time

class My_class(mp.Process):
    my_vars={'name':'', 'num':0}
    def run(self):
        self.name=My_class.my_vars['name']
        self.num=My_class.my_vars['num']
        print self.name, "created and waiting for", str(self.num), "seconds"
        time.sleep(self.num)
        print self.name, "exiting"
        self.x()

    def x(self):
        print self.name, "X"

if __name__ == '__main__':
    print 'main started'
    p1=My_class()
    p2=My_class()
    My_class.my_vars['name']='p1'
    My_class.my_vars['num']=20
    p1.start()
    My_class.my_vars['name']='p2'
    My_class.my_vars['num']=10
    p2.start()  
    print 'main exited'

哪个工作正常.但我想对于像大型列表或对象这样的复杂参数可能会失败.

有没有其他方法来传递参数？

Answer 1

您可以实现一个__init__方法My_class,它采用您想要提供的两个参数:

import multiprocessing as mp 
import time

class My_class(mp.Process):
    def __init__(self, name, num):
        super(My_class, self).__init__()
        self.name = name
        self.num = num

    def run(self):
        print self.name, "created and waiting for", str(self.num), "seconds"
        time.sleep(self.num)
        print self.name, "exiting"
        self.x()

    def x(self):
        print self.name, "X"

if __name__ == '__main__':
    print 'main started'
    p1=My_class('p1', 20)
    p2=My_class('p2', 10)
    p1.start()
    p2.start()  
    print 'main exited'

您只需要确保调用super(My_class, self).__init__()您的__init__方法,以便您的类正确初始化为Process子类.