diff --git a/examples/cluster.py b/examples/cluster.py
index 8171361..7f3c09b 100755
--- a/examples/cluster.py
+++ b/examples/cluster.py
@@ -79,7 +79,7 @@ from mininet.link import Link, Intf
 from mininet.net import Mininet
 from mininet.topo import LinearTopo
 from mininet.topolib import TreeTopo
-from mininet.util import quietRun, makeIntfPair, errRun, retry
+from mininet.util import quietRun, errRun, retry
 from mininet.examples.clustercli import CLI
 from mininet.log import setLogLevel, debug, info, error
 
@@ -293,7 +293,7 @@ class RemoteOVSSwitch( RemoteMixin, OVSSwitch ):
                  StrictVersion( '1.10' ) )
 
     @classmethod
-    def batchShutdown( cls, *args, **kwargs ):
+    def batchShutdown( cls, *_args, **_kwargs ):
         "Not implemented yet"
         return False
 
diff --git a/mininet/link.py b/mininet/link.py
index 4033757..7033839 100644
--- a/mininet/link.py
+++ b/mininet/link.py
@@ -462,7 +462,6 @@ class Link( object ):
         return makeIntfPair( intfname1, intfname2, addr1, addr2, node1, node2,
                              deleteIntfs=deleteIntfs )
 
-
     def delete( self ):
         "Delete this link"
         self.intf1.delete()