diff --git a/wx/lib/pubsub/core/callables.py b/wx/lib/pubsub/core/callables.py
index 00c8a061..3c4a9b10 100644
--- a/wx/lib/pubsub/core/callables.py
+++ b/wx/lib/pubsub/core/callables.py
@@ -57,16 +57,16 @@ def getRawFunction(callable_):
     recognized type (function, method or has __call__ method)."""
     firstArg = 0
     if isfunction(callable_):
-        #print('Function', getID(callable_))
+        #print('Function %s' % getID(callable_))
         func = callable_
     elif ismethod(callable_):
-        #print('Method', getID(callable_))
+        #print('Method %s' % getID(callable_))
         func = callable_
         if func.__self__ is not None:
             # Method is bound, don't care about the self arg
             firstArg = 1
     elif hasattr(callable_, '__call__'):
-        #print('Functor', getID(callable_))
+        #print('Functor %s' % getID(callable_))
         func = callable_.__call__
         firstArg = 1  # don't care about the self arg
     else:
diff --git a/wx/lib/pubsub/core/kwargs/datamsg.py b/wx/lib/pubsub/core/kwargs/datamsg.py
index ef68b770..15c1ac04 100644
--- a/wx/lib/pubsub/core/kwargs/datamsg.py
+++ b/wx/lib/pubsub/core/kwargs/datamsg.py
@@ -12,8 +12,8 @@ class Message:
     via Message.data, while the topic name is available in Message.topic::
     
         def listener(msg):
-            print("data is ", msg.data)
-            print("topic name is ", msg.topic)
+            print("data is %s" % msg.data)
+            print("topic name is %s" % msg.topic)
             print(msg)
             
     The example also shows (last line) how a message is convertible to a string.
diff --git a/wx/lib/pubsub/core/kwargs/publisher.py b/wx/lib/pubsub/core/kwargs/publisher.py
index 5e3fd255..ba08cc7e 100644
--- a/wx/lib/pubsub/core/kwargs/publisher.py
+++ b/wx/lib/pubsub/core/kwargs/publisher.py
@@ -72,6 +72,6 @@ class PublisherArg1Stage2(Publisher):
 
 if policies.msgProtocolTransStage is not None:
     Publisher = PublisherArg1Stage2
-    #print('Using protocol', Publisher)
+    #print('Using protocol %s' % Publisher)
 
 
diff --git a/wx/lib/pubsub/core/topicobj.py b/wx/lib/pubsub/core/topicobj.py
index 368ffecc..5f218f32 100644
--- a/wx/lib/pubsub/core/topicobj.py
+++ b/wx/lib/pubsub/core/topicobj.py
@@ -409,7 +409,7 @@ class Topic(PublisherMixin):
                     self.__handlingUncaughtListenerExc = False
                 except Exception:
                     exc = py2and3.getexcobj()
-                    #print('exception raised', exc)
+                    #print('Exception raised\n%s' % exc)
                     self.__handlingUncaughtListenerExc = False
                     raise ExcHandlerError(listener.name(), topicObj, exc)
 
diff --git a/wx/lib/pubsub/policies.py b/wx/lib/pubsub/policies.py
index 239c0054..16b90200 100644
--- a/wx/lib/pubsub/policies.py
+++ b/wx/lib/pubsub/policies.py
@@ -19,8 +19,8 @@ def setMsgDataArgName(stage, listenerArgName, senderArgNameAny=False):
     senderKwargNameAny = senderArgNameAny
     msgDataArgName = listenerArgName
     msgProtocolTransStage = stage
-    #print(repr(policies.msgProtocolTransStage),
-    #      repr(policies.msgDataProtocol),
-    #      repr(policies.senderKwargNameAny),
-    #      repr(policies.msgDataArgName))
-    #print('override "arg1" protocol arg name:', argName)
+    #print('%s' % repr(policies.msgProtocolTransStage))
+    #print('%s' % repr(policies.msgDataProtocol))
+    #print('%s' % repr(policies.senderKwargNameAny))
+    #print('%s' % repr(policies.msgDataArgName))
+    #print('override "arg1" protocol arg name: %s' % argName)