Task example.

task.py

@@ -0,0 +1,44 @@
+#!/usr/bin/env python
+
+
+# https://twistedmatrix.com/documents/16.2.0/core/howto/defer.html
+
+# task has no problem with stop() and .start()
+# Why would it be getting lost in my code, I wonder?  >:(
+
+
+from twisted.internet import reactor, defer, task
+from pprint import pprint
+
+import pendulum
+
+def now():
+    return pendulum.now().to_datetime_string()
+
+def awake():
+    print("awake", now())
+
+def startTask(d):
+    global t
+    print("task awake, {0}".format(d), now())
+    t = task.LoopingCall(awake)
+    t.start(d)
+
+def stopTask(d):
+    global t
+    print("STOP!", now())
+    t.stop()
+    reactor.callLater(d*2 + 1, startTask, d)
+
+d = 2
+reactor.callLater(1, startTask, d)
+reactor.callLater(d * 3 + 1, stopTask, d + 1)
+
+
+print("Stop the reactor in 40 seconds...", now())
+reactor.callLater(40, reactor.stop)
+print("starting the reactor", now())
+reactor.run()
+
+print("Done.", now())
+print("Reactor has been safely shutdown.  :P")