diff --git a/mininet/cli.py b/mininet/cli.py
index fa8a50ba50aec4bef9615cceb88f2b845eab14a5..b9dbc3f8baefe9809acc3cc40bf6289123e64263 100644
--- a/mininet/cli.py
+++ b/mininet/cli.py
@@ -293,7 +293,6 @@ def default( self, line ):
             self.waitForNode( node )
         else:
             error( '*** Unknown command: %s\n' % first )
-        
 
     # pylint: enable-msg=W0613,R0201
 
diff --git a/mininet/topo.py b/mininet/topo.py
index 9547fa129a1ec7e3a646c26a6f63330059c9d53e..07f74efabb683fb1b8f14cee554219cbc0a44523 100644
--- a/mininet/topo.py
+++ b/mininet/topo.py
@@ -132,12 +132,12 @@ def add_port(self, src, dst):
         if src not in self.ports:
             self.ports[src] = {}
         if dst not in self.ports[src]:
-            # num outlinks    
+            # num outlinks
             self.ports[src][dst] = len(self.ports[src]) + src_base
         if dst not in self.ports:
             self.ports[dst] = {}
         if src not in self.ports[dst]:
-            # num outlinks 
+            # num outlinks
             self.ports[dst][src] = len(self.ports[dst]) + dst_base
 
     def node_enabled(self, dpid):
@@ -185,7 +185,6 @@ def is_switch(self, n):
         '''Returns true if node is a switch.'''
         return self.node_info[n].is_switch
 
-
     def switches(self, enabled = True):
         '''Return switches.