Use multiprocessing in PythonDLL

multiprocessing_example.py

import multiprocessing
import sys

__file__ = r'path_to\multiprocessing_example.py'
sys.argv = [__file__]

python_exe = r'path_to\python.exe'


def getresult(outp):
    while True:
        array = outp.recv()
        outp.send(array[:2])


class MQL():
    def __init__(self):
        self.proc = None

    def getLong(self, magic: int, value: int, array: tuple) -> tuple or list:
        raise NotImplementedError

    def getULong(self, magic: int, value: int, array: tuple) -> tuple or list:
        raise NotImplementedError

    def getDouble(self, magic: int, value: float, array: tuple) -> tuple or list:
        if self.proc is None:
            multiprocessing.set_executable(python_exe)
            (self.inp, self.outp) = multiprocessing.Pipe(True)
            self.proc = multiprocessing.Process(target=getresult, args=(self.outp,))
            self.proc.daemon = True
            self.proc.start()
        self.inp.send(array)
        ret = self.inp.recv()
        print(ret)
        return ret

    def getString(self, magic: int, value: str, array: bytes) -> str:
        raise NotImplementedError


__mql__ = MQL()