diff --git a/examples/tree1024.py b/examples/tree1024.py
index 42318cc..2fb001d 100755
--- a/examples/tree1024.py
+++ b/examples/tree1024.py
@@ -17,7 +17,7 @@ def TreeNet( depth=1, fanout=2, **kwargs ):
     "Convenience function for creating tree networks."
     topo = TreeTopo( depth, fanout )
     return Mininet( topo, **kwargs )
-    
+
 if __name__ == '__main__':
     setLogLevel( 'info' )
     init()
diff --git a/examples/treeping64.py b/examples/treeping64.py
index 96edba3..ceb0a80 100755
--- a/examples/treeping64.py
+++ b/examples/treeping64.py
@@ -1,8 +1,7 @@
 #!/usr/bin/python
 
 "Create a 64-node tree network, and test connectivity using ping."
-   
-from mininet.cli import CLI
+
 from mininet.log import setLogLevel
 from mininet.net import init, Mininet
 from mininet.node import KernelSwitch, UserSwitch, OVSKernelSwitch
@@ -12,8 +11,10 @@ def TreeNet( depth=1, fanout=2, **kwargs ):
     "Convenience function for creating tree networks."
     topo = TreeTopo( depth, fanout )
     return Mininet( topo, **kwargs )
-    
+
 def treePing64():
+    "Run ping test on 64-node tree networks."
+
     results = {}
     switches = { 'reference kernel': KernelSwitch,
         'reference user': UserSwitch,
@@ -26,13 +27,13 @@ def treePing64():
         result = network.run( network.pingAll )
         results[ name ] = result
 
-    print  
+    print
     print "*** Tree network ping results:"
     for name in switches.keys():
         print "%s: %d%% packet loss" % ( name, results[ name ] )
     print
-   
+
 if __name__ == '__main__':
-   setLogLevel( 'info' )
-   init()
-   treePing64()
\ No newline at end of file
+    setLogLevel( 'info' )
+    init()
+    treePing64()
diff --git a/mininet/log.py b/mininet/log.py
index f999714..a16505f 100644
--- a/mininet/log.py
+++ b/mininet/log.py
@@ -170,9 +170,9 @@ def makeListCompatible( fn ):
     setattr( newfn, '__doc__', fn.__doc__ )
     return newfn
 
-info, output, warn, error, debug = ( 
-    lg.info, lg.output, lg.warn, lg.error, lg.debug ) = [ 
-        makeListCompatible( f ) for f in 
+info, output, warn, error, debug = (
+    lg.info, lg.output, lg.warn, lg.error, lg.debug ) = [
+        makeListCompatible( f ) for f in
             lg.info, lg.output, lg.warn, lg.error, lg.debug ]
 
 setLogLevel = lg.setLogLevel