diff --git a/examples/consoles.py b/examples/consoles.py
index f131b1c..54fb32c 100755
--- a/examples/consoles.py
+++ b/examples/consoles.py
@@ -77,7 +77,8 @@ class Console( Frame ):
             **self.buttonStyle )
         label.pack( side='top', fill='x' )
         text = Text( self, wrap='word', **self.textStyle )
-        ybar = Scrollbar( self, orient='vertical', width=7, command=text.yview )
+        ybar = Scrollbar( self, orient='vertical', width=7,
+            command=text.yview )
         text.configure( yscrollcommand=ybar.set )
         text.pack( side='left', expand=True, fill='both' )
         ybar.pack( side='right', fill='y' )
@@ -98,7 +99,7 @@ class Console( Frame ):
 
     # We're not a terminal (yet?), so we ignore the following
     # control characters other than [\b\n\r]
-    ignoreChars  = re.compile( r'[\x00-\x07\x09\x0b\x0c\x0e-\x1f]+' )
+    ignoreChars = re.compile( r'[\x00-\x07\x09\x0b\x0c\x0e-\x1f]+' )
 
     def append( self, text ):
         "Append something to our text frame."
@@ -134,7 +135,7 @@ class Console( Frame ):
         "Handle control-c."
         self.node.sendInt()
     # pylint: enable-msg=W0613
-    
+
     def sendCmd( self, cmd ):
         "Send a command to our node."
         if not self.node.waiting:
@@ -196,7 +197,7 @@ class Graph( Frame ):
         height = float( self.gheight )
         width = 25
         ymax = self.ymax
-        scale = Canvas( self, width=width, height=height, 
+        scale = Canvas( self, width=width, height=height,
             background=self.bg )
         opts = { 'fill': 'red' }
         # Draw scale line
@@ -268,7 +269,7 @@ class Graph( Frame ):
         "Add a bar for testing purposes."
         ms = 1000
         if self.xpos < 10:
-            self.addBar( self.xpos/10 * self.ymax  )
+            self.addBar( self.xpos / 10 * self.ymax  )
             self.after( ms, self.test )
 
     def setTitle( self, text ):
@@ -279,7 +280,7 @@ class Graph( Frame ):
 class ConsoleApp( Frame ):
 
     "Simple Tk consoles for Mininet."
-    
+
     menuStyle = { 'font': 'Geneva 7 bold' }
 
     def __init__( self, net, parent=None, width=4 ):
diff --git a/examples/miniedit.py b/examples/miniedit.py
index 1d2a9e0..7cfe833 100755
--- a/examples/miniedit.py
+++ b/examples/miniedit.py
@@ -67,7 +67,7 @@ class MiniEdit( Frame ):
 
         # Initialize node data
         self.nodeBindings = self.createNodeBindings()
-        self.nodePrefixes =  { 'Switch': 's', 'Host': 'h' }
+        self.nodePrefixes = { 'Switch': 's', 'Host': 'h' }
         self.widgetToItem = {}
         self.itemToWidget = {}
 
@@ -176,7 +176,8 @@ class MiniEdit( Frame ):
         "Update canvas scroll region to hold everything."
         bbox = self.canvas.bbox( 'all' )
         if bbox is not None:
-            self.canvas.configure( scrollregion=( 0, 0, bbox[ 2 ], bbox[ 3 ] ) )
+            self.canvas.configure( scrollregion=( 0, 0, bbox[ 2 ],
+                bbox[ 3 ] ) )
 
     def canvasx( self, x_root ):
         "Convert root x coordinate to canvas coordinate."
@@ -221,7 +222,7 @@ class MiniEdit( Frame ):
         # Commands
         for cmd, color in [ ( 'Stop', 'darkRed' ), ( 'Run', 'darkGreen' ) ]:
             doCmd = getattr( self, 'do' + cmd )
-            b = Button( toolbar, text=cmd, font=self.smallFont, 
+            b = Button( toolbar, text=cmd, font=self.smallFont,
                 fg=color, command=doCmd )
             b.pack( fill='x', side='bottom' )
 
@@ -324,7 +325,7 @@ class MiniEdit( Frame ):
         self.nodeCount += 1
         name = self.nodePrefixes[ node ] + str( self.nodeCount )
         icon = self.nodeIcon( node, name )
-        item = self.canvas.create_window( x, y, anchor='c', 
+        item = self.canvas.create_window( x, y, anchor='c',
             window=icon, tags=node )
         self.widgetToItem[ icon ] = item
         self.itemToWidget[ item ] = icon
@@ -449,21 +450,26 @@ class MiniEdit( Frame ):
         self.linkx, self.linky = x, y
         self.linkWidget = w
         self.linkItem = item
+
         # Link bindings
         # Selection still needs a bit of work overall
         # Callbacks ignore event
         # pylint: disable-msg=W0613
+
         def select( event, link=self.link ):
             "Select item on mouse entry."
             self.selectItem( link )
+
         def highlight( event, link=self.link ):
             "Highlight item on mouse entry."
             # self.selectItem( link )
             self.canvas.itemconfig( link, fill='green' )
+
         def unhighlight( event, link=self.link ):
             "Unhighlight item on mouse exit."
             self.canvas.itemconfig( link, fill='blue' )
             # self.selectItem( None )
+
         # pylint: disable-msg=W0613
         self.canvas.tag_bind( self.link, '<Enter>', highlight )
         self.canvas.tag_bind( self.link, '<Leave>', unhighlight )
@@ -520,7 +526,6 @@ class MiniEdit( Frame ):
         # Show (existing) window
         about.deiconify()
 
-
     def createToolImages( self ):
         "Create toolbar (and icon) images."
 
@@ -575,7 +580,7 @@ class MiniEdit( Frame ):
         # Make links
         for link in self.links.values():
             ( src, dst ) = link
-            srcName, dstName  = src[ 'text' ], dst[ 'text' ]
+            srcName, dstName = src[ 'text' ], dst[ 'text' ]
             src, dst = net.nameToNode[ srcName ], net.nameToNode[ dstName ]
             src.linkTo( dst )
 
@@ -615,7 +620,7 @@ def miniEditImages():
     # Image data. Git will be unhappy. However, the alternative
     # is to keep track of separate binary files, which is also
     # unappealing.
-        
+
     return {
         'Select': BitmapImage(
             file='/usr/include/X11/bitmaps/left_ptr' ),
@@ -706,7 +711,3 @@ if __name__ == '__main__':
     setLogLevel( 'info' )
     app = MiniEdit()
     app.mainloop()
-
-
-
-
diff --git a/examples/tree1024.py b/examples/tree1024.py
index 4684d2d..0af55e1 100755
--- a/examples/tree1024.py
+++ b/examples/tree1024.py
@@ -16,4 +16,3 @@ if __name__ == '__main__':
     setLogLevel( 'info' )
     network = TreeNet( depth=2, fanout=32, switch=KernelSwitch )
     network.run( CLI, network )
-
diff --git a/examples/udpbwgraph.py b/examples/udpbwgraph.py
index 8e4ffd8..278da73 100755
--- a/examples/udpbwgraph.py
+++ b/examples/udpbwgraph.py
@@ -214,7 +214,7 @@ class UdpBwTest( Frame ):
         switch = self.controls.switch()
         controller = self.controls.controller()
 
-        self.net = Mininet( self.topo, switch=switch, 
+        self.net = Mininet( self.topo, switch=switch,
             controller=controller )
         self.hosts = self.net.hosts
         self.hostCount = len( self.hosts )
@@ -252,7 +252,8 @@ class UdpBwTest( Frame ):
             seconds, inbw, outbw = parsebwtest( line )
             if seconds is None:
                 break
-            result = self.results.get( seconds, [] ) + [ ( host, inbw, outbw ) ]
+            result = self.results.get( seconds, [] ) + [
+                ( host, inbw, outbw ) ]
             self.results[ seconds ] = result
             if len( result ) == self.hostCount:
                 # Calculate total and update graph
@@ -260,7 +261,7 @@ class UdpBwTest( Frame ):
                 totalin = 0
                 for host, inbw, outbw in result:
                     totalin += inbw
-                self.graph.addBar( totalin * 8.0/1000.0 )
+                self.graph.addBar( totalin * 8.0 / 1000.0 )
                 print totalin
         # Fileevent might be better, but for now we just poll every 500ms
         self.graph.after( 500, self.updateGraph )
@@ -306,5 +307,3 @@ if __name__ == '__main__':
     setLogLevel( 'info' )
     app = UdpBwTest( topo=TreeTopo( depth=2, fanout=2 ) )
     app.mainloop()
-
-
diff --git a/mininet/clean.py b/mininet/clean.py
index 8dc626a..3052e97 100755
--- a/mininet/clean.py
+++ b/mininet/clean.py
@@ -52,4 +52,3 @@ def cleanup():
             sh( "ip link del " + link )
 
     info( "*** Cleanup complete.\n" )
-
diff --git a/mininet/cli.py b/mininet/cli.py
index a2d5437..a10363d 100644
--- a/mininet/cli.py
+++ b/mininet/cli.py
@@ -111,7 +111,7 @@ class CLI( Cmd ):
             output( switch.name, '<->' )
             for intf in switch.intfs.values():
                 # Ugly, but pylint wants it
-                name  = switch.connection.get( intf,
+                name = switch.connection.get( intf,
                     ( None, 'Unknown ' ) )[ 1 ]
                 output( ' %s' % name )
             output( '\n' )
diff --git a/mininet/net.py b/mininet/net.py
index 0e45003..41efb6a 100755
--- a/mininet/net.py
+++ b/mininet/net.py
@@ -147,7 +147,6 @@ class Mininet( object ):
         if topo and build:
             self.build()
 
-
     def addHost( self, name, mac=None, ip=None ):
         """Add host.
            name: name of host to add
diff --git a/mininet/node.py b/mininet/node.py
index 48e8b43..9e18180 100644
--- a/mininet/node.py
+++ b/mininet/node.py
@@ -437,7 +437,7 @@ class UserSwitch( Switch ):
         if self.inNamespace:
             intfs = intfs[ :-1 ]
         self.cmd( 'ofdatapath -i ' + ','.join( intfs ) +
-            ' punix:/tmp/' + self.name  +
+            ' punix:/tmp/' + self.name +
             ' 1> ' + ofdlog + ' 2> ' + ofdlog + ' &' )
         self.cmd( 'ofprotocol unix:/tmp/' + self.name +
             ' tcp:' + controller.IP() + ' --fail=closed ' + self.opts +
@@ -486,11 +486,11 @@ class KernelSwitch( Switch ):
             raise Exception( 'only contiguous, zero-indexed port ranges'
                             'supported: %s' % ports )
         intfs = [ self.intfs[ port ] for port in ports ]
-        self.cmd( 'dpctl',  'addif', self.dp, ' '.join( intfs ) )
+        self.cmd( 'dpctl', 'addif', self.dp, ' '.join( intfs ) )
         # Run protocol daemon
         controller = controllers[ 0 ]
         self.cmd( 'ofprotocol ' + self.dp +
-            ' tcp:%s:%d' %  ( controller.IP(), controller.port ) +
+            ' tcp:%s:%d' % ( controller.IP(), controller.port ) +
             ' --fail=closed ' + self.opts +
             ' 1> ' + ofplog + ' 2>' + ofplog + ' &' )
         self.execed = False
@@ -540,11 +540,11 @@ class OVSKernelSwitch( Switch ):
             raise Exception( 'only contiguous, zero-indexed port ranges'
                             'supported: %s' % self.intfs )
         intfs = [ self.intfs[ port ] for port in ports ]
-        self.cmd( 'ovs-dpctl',  'add-if',  self.dp,  ' '.join( intfs ) )
+        self.cmd( 'ovs-dpctl', 'add-if', self.dp, ' '.join( intfs ) )
         # Run protocol daemon
         controller = controllers[ 0 ]
         self.cmd( 'ovs-openflowd ' + self.dp +
-            ' tcp:%s:%i' % ( controller.IP(),  controller.port ) +
+            ' tcp:%s:%i' % ( controller.IP(), controller.port ) +
             ' --fail=closed ' + self.opts +
             ' 1>' + ofplog + ' 2>' + ofplog + '&' )
         self.execed = False
@@ -577,7 +577,7 @@ class Controller( Node ):
         if self.cdir is not None:
             self.cmd( 'cd ' + self.cdir )
         self.cmd( self.controller + ' ' + self.cargs +
-            ' 1>' + cout +  ' 2>' + cout + '&' )
+            ' 1>' + cout + ' 2>' + cout + '&' )
         self.execed = False
 
     def stop( self ):
diff --git a/mininet/term.py b/mininet/term.py
index 437c485..3cd70f2 100644
--- a/mininet/term.py
+++ b/mininet/term.py
@@ -58,4 +58,3 @@ def makeTerms( nodes, title='Node', term='xterm' ):
        title: base title for each
        returns: list of created terminal processes"""
     return [ makeTerm( node, title, term ) for node in nodes ]
-