Only do the output reporting if a report argument was given (regardle…

…ss what was given, at the moment)

brian2/core/network.py

@@ -345,19 +345,21 @@ def run(self, duration, report=None, report_period=60*second,
 
         # Find the first clock to be updated (see note below)
         clock, curclocks = self._nextclocks()
-        start = time.time()
-        next_report_time = start + 10
+        if report is not None:
+            start = current = time.time()
+            next_report_time = start + 10
         while clock.running and not self._stopped and not Network._globally_stopped:
             # update the network time to this clocks time
             self.t_ = clock.t_
-            current = time.time()
-            if current > next_report_time:
-                report = '{t} simulated ({percent}%), estimated {remaining} s remaining.'
-                remaining = int(round((current - start)/self.t*(duration-self.t)))
-                print report.format(t=self.t, percent=int(round(100*self.t/duration)),
-                                    remaining=remaining)
-                next_report_time = current + 10
-            # update the objects with this clock
+            if report is not None:
+                current = time.time()
+                if current > next_report_time:
+                    report_msg = '{t} simulated ({percent}%), estimated {remaining} s remaining.'
+                    remaining = int(round((current - start)/self.t*(duration-self.t)))
+                    print report_msg.format(t=self.t, percent=int(round(100*self.t/duration)),
+                                            remaining=remaining)
+                    next_report_time = current + 10
+                # update the objects with this clock
             for obj in self.objects:
                 if obj.clock in curclocks and obj.active:
                     obj.update()
@@ -371,7 +373,9 @@ def run(self, duration, report=None, report_period=60*second,
             clock, curclocks = self._nextclocks()
 
         self.t = t_end
-
+
+        if report is not None:
+            print 'Took ', current-start, 's in total.'
         self.post_run()
 
     def stop(self):