adding chapter 7 source code

Chapter7/multithreading/thread4.py

@@ -0,0 +1,34 @@
+# thread4.py with queue and custom Thread class
+
+from queue import Queue
+from threading import Thread as Thread
+from time import sleep
+
+class MyWorker (Thread):
+   def __init__(self, name, q):
+      Thread.__init__(self)
+      self.name = name
+      self.queue = q
+
+   def run(self):
+      while True:
+          item = self.queue.get()
+          sleep(1)
+          try:
+              print ("{}: {}".format(self.name, item))
+          finally:
+            self.queue.task_done()
+
+#filling the queue
+myqueue = Queue()
+for i in range (10):
+    myqueue.put("Task {}".format(i+1))
+
+# creating threads
+for i in range (5):
+    worker = MyWorker("Th {}".format(i+1), myqueue)
+    worker.daemon = True
+    worker.start()
+
+myqueue.join()
+