add __lt__ function to make tasks orderable (so heappush is happy in py34), update metaclass syntax in py34 singleton

py25/bacpypes/task.py

@@ -92,6 +92,9 @@ class _Task(DebugContents, Logging):
 
         _task_manager.resume_task(self)
 
+    def __lt__(self, other):
+        return id(self) < id(other)
+
 #
 #   OneShotTask
 #

py27/bacpypes/task.py

@@ -92,6 +92,9 @@ class _Task(DebugContents, Logging):
 
         _task_manager.resume_task(self)
 
+    def __lt__(self, other):
+        return id(self) < id(other)
+
 #
 #   OneShotTask
 #

py34/bacpypes/singleton.py

@@ -56,18 +56,18 @@ class _SingletonMetaclass(type):
 #   Singleton
 #
 
-class Singleton(object):
+class Singleton(metaclass=_SingletonMetaclass):
 
-    __metaclass__ = _SingletonMetaclass
+    pass
 
 #
 #   _SingletonLoggingMetaclass
 #
 
 class _SingletonLoggingMetaclass(_SingletonMetaclass, debugging._LoggingMetaclass):
+
     pass
 
-class SingletonLogging(object):
+class SingletonLogging(metaclass=_SingletonLoggingMetaclass):
-
-    __metaclass__ = _SingletonLoggingMetaclass
 
+    pass

py34/bacpypes/task.py

@@ -92,6 +92,9 @@ class _Task(DebugContents, Logging):
 
         _task_manager.resume_task(self)
 
+    def __lt__(self, other):
+        return id(self) < id(other)
+
 #
 #   OneShotTask
 #