added definition of external worker process

code/worker.py

@@ -0,0 +1,40 @@
+from multiprocessing import Process, Queue
+import time
+from typing import List
+import os
+
+
+class Worker(object):
+    def __init__(self, queue: Queue):
+        self.run_flag = True
+        self.queue = queue
+        self.process = Process(
+            target=self.handle_jobs,
+            args=(self.queue,)
+        )
+        time.sleep(1)
+        self.process.start()
+
+    def stop(self):
+        self.queue.put(['exit'])
+        self.process.join()
+
+    @staticmethod
+    def handle_jobs(queue: Queue):
+        while True:
+            if queue.empty():
+                time.sleep(1)
+                continue
+            cmd_list: List[str] = queue.get()
+            print('received job:\n', cmd_list)
+            if cmd_list[0].lower() == 'exit':
+                break
+            cmd_str = ' && '.join(cmd_list)
+            os.system(cmd_str)
+
+
+if __name__ == '__main__':
+    work_queue: Queue = Queue()
+    worker = Worker(queue=work_queue)
+    work_queue.put(['echo "hello world"', 'echo "hello world again"'])
+    worker.stop()