added python threading example

lesson02/example3_threading.py

@@ -0,0 +1,30 @@
+""" Example 3
+Threading
+"""
+
+import threading
+import time
+
+
+class MyThread(threading.Thread):
+	""" Example thread class extending the base thread class
+
+	Arguments:
+		threading {[type]} -- [description]
+	"""
+
+	def run(self):
+		""" Run the thread and log it
+		"""
+
+		print "{} started!".format(self.getName())  # Thread-x started!
+		time.sleep(1)  # Pretend to work for a second
+		print "{} finished!".format(self.getName())  # "Thread-x finished!"
+
+
+if __name__ == '__main__':
+	for x in range(4):  # Four times...
+		mythread = MyThread(name="Thread-{}".format(
+		    x + 1))  # ...Instantiate a thread and pass a unique ID to it
+		mythread.start()  # ...Start the thread
+		time.sleep(.6)  # ...Wait 0.6 seconds before starting another