thread_with_return_value.py

import threading

class Thread(threading.Thread):
    def __init__(self, group=None, target=None, name=None, args=(), kwargs=None, *, daemon=None):
        threading.Thread.__init__(self, group, target, name, args, kwargs, daemon=daemon)
        self._return = None

    def run(self):
        if self._target is not None:
            self._return = self._target(*self._args, **self._kwargs)

    def join(self):
        threading.Thread.join(self)
        return self._return