Pool within a Class in Python

Question

I would like to use Pool within a class, but there seems to be a problem. My code is long, I created a small-demo variant to illustrated the problem. It would be great if yo

Answer 1

You have an error, because pickle can't serialize instancemethod. So you should use this tiny workaround:

from itertools import repeat
from multiprocessing import Pool


class SeriesInstance:
    def __init__(self):
        self.numbers = [1, 2, 3]

    def F(self, x):
        return x * x

    def run(self):
        p = Pool()
        print(list(p.starmap(SeriesInstance.F, zip(repeat(self), self.numbers))))


if __name__ == '__main__':
    SeriesInstance().run()