Pass code check with pylint=2.4.4 (#1012)

examples/mobility.py

@@ -19,14 +19,13 @@ to-do:
 - think about clearing last hop - why doesn't that work?
 """
 
+from random import randint
 
 from mininet.net import Mininet
 from mininet.node import OVSSwitch
 from mininet.topo import LinearTopo
 from mininet.log import info, output, warn, setLogLevel
 
-from random import randint
-
 
 class MobilitySwitch( OVSSwitch ):
     "Switch that can reattach and rename interfaces"
@@ -38,6 +37,7 @@ class MobilitySwitch( OVSSwitch ):
         del self.intfs[ port ]
         del self.nameToIntf[ intf.name ]
 
+    # pylint: disable=arguments-differ
     def addIntf( self, intf, rename=False, **kwargs ):
         "Add (and reparent) an interface"
         OVSSwitch.addIntf( self, intf, **kwargs )
@@ -132,6 +132,7 @@ def mobilityTest():
         old = new
     net.stop()
 
+
 if __name__ == '__main__':
     setLogLevel( 'info' )
     mobilityTest()