diff --git a/__init__.py b/__init__.py
index 3f0e821..f345ba8 100644
--- a/__init__.py
+++ b/__init__.py
@@ -159,13 +159,14 @@ class threaded_queue(queue):
 
     .. literalinclude:: task/_examples_/threaded_queue.log
     """
+
     def __init__(self, expire=False):
         queue.__init__(self, expire=expire)
         self.thread = None
 
     def run(self):
         if self.thread is None:
-            self.thread = threading.Thread(target=self._start, args=())
+            self.thread = threading.Thread(target=self._start, args=(), daemon=True)
             self.thread.daemon = True    # Daemonize thread
             self.thread.start()          # Start the execution
 
@@ -206,6 +207,7 @@ class periodic(object):
 
     .. literalinclude:: task/_examples_/periodic.log
     """
+
     def __init__(self, cycle_time, callback, *args, **kwargs):
         self._lock = threading.Lock()
         self._timer = None
@@ -253,6 +255,7 @@ class periodic(object):
             self._timer = threading.Timer(0, self._start)
         else:
             self._timer = threading.Timer(self.cycle_time, self._start)
+        self._timer.daemon = True
         self._timer.start()
         self._lock.release()
 
@@ -281,6 +284,7 @@ class delayed(periodic):
 
     .. literalinclude:: task/_examples_/delayed.log
     """
+
     def run(self):
         """
         This starts the timer for the delayed execution.
@@ -329,12 +333,14 @@ class crontab(periodic):
         """
         class all_match(set):
             """Universal set - match everything"""
+
             def __contains__(self, item):
                 (item)
                 return True
 
         def __init__(self, minute, hour, day_of_month, month, day_of_week, callback, *args, **kwargs):
-            self.set_trigger_conditions(minute or crontab.ANY, hour or crontab.ANY, day_of_month or crontab.ANY, month or crontab.ANY, day_of_week or crontab.ANY)
+            self.set_trigger_conditions(minute or crontab.ANY, hour or crontab.ANY,
+                                        day_of_month or crontab.ANY, month or crontab.ANY, day_of_week or crontab.ANY)
             self.callback = callback
             self.args = args
             self.kwargs = kwargs
@@ -369,7 +375,7 @@ class crontab(periodic):
         def __conv_to_set__(self, obj):
             if obj is crontab.ANY:
                 return self.all_match()
-            elif isinstance(obj, (int, long) if sys.version_info < (3,0) else (int)):
+            elif isinstance(obj, (int, long) if sys.version_info < (3, 0) else (int)):
                 return set([obj])
             else:
                 return set(obj)