Python subclassing process with parameter

Question

I'm trying to create an object but as a new process. I'm following this guide and came up with this code. ``` 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' ``` But here I'm unable to pass arguments to the object. I searched but found none. It's not like a normal multiprocess where we'd be doing something like: ``` p1 = multiprocessing.Process(target=My_class, args=('p1',10,)) ``` to pass the arguments to the new process. But the multiprocessing for a class instance is different. For now I'm passing it the hard way like below. ``` 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.nam…

Accepted Answer

You can just implement an `__init__` method for `My_class`, which takes the two parameters you want to provide:

```
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'
```

You just need to be sure to call `super(My_class, self).__init__()` in your `__init__` method, so that your class is properly initialized as a `Process` subclass.

Python subclassing process with parameter

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