add event

event.py

@@ -0,0 +1,7 @@
+class Event(object):
+    # keep a (static) class variable to keep track of total events
+    count = 0
+    def __init__(self, time):
+        self.time = time
+        self.id = Event.count
+        Event.count += 1

feq.py

@@ -8,9 +8,9 @@ def schedule_event(self, event):
         # in case we have two events scheduled to happen at the same time
         # and we want/need one to happen before the other, we schedule
         # first according to the time and second according to the number
-        # of the event
+        # of the event (ie, event #1 before event #2)
         heapq.heappush(self._priority_queue, 
-                      ((event.time, event.count), event))
+                      ((event.time, event.id), event))
 
     def next_event(self):
         event_tuple = heapq.heappop(self._priority_queue)