[Python] multiprocessing 사용 하면서 file write 하기

from multiprocessing import Process, Queue

END_TOKEN           = 99999999

class mp_logger:
    def __init__(self, name, path):
        self.name = name
        self.path = path
        self.q = Queue()
        self.p = None
        self.join_timeout = 1

    def start(self):
        self.p = Process(target=self.__listen)
        self.p.start()

    def __listen(self):
        with open(
                "{PATH}{NAME}.txt".format(PATH = self.path, NAME = self.name), "w"
        ) as output:
            while True:
                line = self.q.get()
                if line == END_TOKEN:
                    break

                # Convert other object to text
                if not isinstance(line, str):
                    line = str(line)
                output.write(str(line))

    def close(self):
        assert(self.p != None)

        if self.p.is_alive():
            self.q.put(END_TOKEN)

        self.p.join(self.join_timeout)

    def write(self, data):
        assert(self.p != None)
        self.q.put(data)