How to use classes with Python multiprocessing?

Question

Here\'s some sample code that is reads a file and adds up each line. It is supposed to add up all the numbers from 0-20. However, I always get a result of 0.

<

Answer 1

You can accomplish this using shared memory with subprocess.Value, just change your Total class to the following:

class Total():
    def __init__(self):
        self.total = multiprocessing.Value('d', 0)

    def add(self, number):
        self.total.value += int(number)

    def __str__(self):
        return str(self.total.value)