diff --git a/TestON/tests/USECASE/SegmentRouting/dependencies/cord_fabric.py b/TestON/tests/USECASE/SegmentRouting/dependencies/cord_fabric.py
index a2a8a8e..c890177 100755
--- a/TestON/tests/USECASE/SegmentRouting/dependencies/cord_fabric.py
+++ b/TestON/tests/USECASE/SegmentRouting/dependencies/cord_fabric.py
@@ -10,84 +10,93 @@
 from mininet.log import setLogLevel
 from mininet.cli import CLI
 
-# Parse command line options and dump results
-def parseOptions():
-    """Parse command line options"""
-    parser = OptionParser()
-    parser.add_option('--spine', dest='spine', type='int', default=2,
-                      help='number of spine switches, default=2')
-    parser.add_option('--leaf', dest='leaf', type='int', default=2,
-                      help='number of leaf switches, default=2')
-    parser.add_option('--fanout', dest='fanout', type='int', default=2,
-                      help='number of hosts per leaf switch, default=2')
-    parser.add_option('--onos', dest='onos', type='int', default=0,
-                      help='number of ONOS Instances, default=0, 0 means localhost, 1 will use OC1 and so on')
 
-    (options, args) = parser.parse_args()
+# Parse command line options and dump results
+def parseOptions( ):
+    """Parse command line options"""
+    parser = OptionParser( )
+    parser.add_option( '--spine', dest='spine', type='int', default=2,
+                       help='number of spine switches, default=2' )
+    parser.add_option( '--leaf', dest='leaf', type='int', default=2,
+                       help='number of leaf switches, default=2' )
+    parser.add_option( '--fanout', dest='fanout', type='int', default=2,
+                       help='number of hosts per leaf switch, default=2' )
+    parser.add_option( '--onos', dest='onos', type='int', default=0,
+                       help='number of ONOS Instances, default=0, 0 means localhost, 1 will use OC1 and so on' )
+
+    (options, args) = parser.parse_args( )
     return options, args
 
-opts, args = parseOptions()
 
-class LeafAndSpine(Topo):
-    def __init__(self, spine=2, leaf=2, fanout=2, **opts):
+opts, args = parseOptions( )
+
+
+class LeafAndSpine( Topo ):
+    def __init__( self, spine=2, leaf=2, fanout=2, **opts ):
         "Create Leaf and Spine Topo."
 
-        Topo.__init__(self, **opts)
+        Topo.__init__( self, **opts )
 
         # Add spine switches
-        spines = {}
-        for s in range(spine):
-            spines[s] = self.addSwitch('spine10%s' % (s + 1), dpid="00000000010%s" % (s + 1))
+        spines = { }
+        for s in range( spine ):
+            spines[ s ] = self.addSwitch( 'spine10%s' % (s + 1),
+                                          dpid="00000000010%s" % (s + 1) )
         # Set link speeds to 100Mb/s
-        linkopts = dict(bw=100)
+        linkopts = dict( bw=100 )
 
         # Add Leaf switches
-        for ls in range(leaf):
-            leafSwitch = self.addSwitch('leaf%s' % (ls + 1), dpid="00000000000%s" % (1+ls))
+        for ls in range( leaf ):
+            leafSwitch = self.addSwitch( 'leaf%s' % (ls + 1),
+                                         dpid="00000000000%s" % (1 + ls) )
             # Connect leaf to all spines
-            for s in range(spine):
-                switch = spines[s]
-                self.addLink(leafSwitch, switch, **linkopts)
+            for s in range( spine ):
+                switch = spines[ s ]
+                self.addLink( leafSwitch, switch, **linkopts )
             # Add hosts under a leaf, fanout hosts per leaf switch
-            for f in range(fanout):
-                host = self.addHost('h%s' % (ls * fanout + f + 1),
-                                         cls=IpHost,
-                                         ip='10.0.%s.%s/24' % ((ls + 1), (f + 1)),
-                                         gateway='10.0.%s.254' % (ls + 1))
-                self.addLink(host, leafSwitch, **linkopts)
+            for f in range( fanout ):
+                host = self.addHost( 'h%s' % (ls * fanout + f + 1),
+                                     cls=IpHost,
+                                     ip='10.0.%s.%s/24' % ((ls + 1), (f + 1)),
+                                     gateway='10.0.%s.254' % (ls + 1) )
+                self.addLink( host, leafSwitch, **linkopts )
 
-class IpHost(Host):
-    def __init__(self, name, gateway, *args, **kwargs):
-        super(IpHost, self).__init__(name, *args, **kwargs)
+
+class IpHost( Host ):
+    def __init__( self, name, gateway, *args, **kwargs ):
+        super( IpHost, self ).__init__( name, *args, **kwargs )
         self.gateway = gateway
 
-    def config(self, **kwargs):
-        Host.config(self, **kwargs)
-        mtu = "ifconfig "+self.name+"-eth0 mtu 1490"
-        self.cmd(mtu)
-        self.cmd('ip route add default via %s' % self.gateway)
+    def config( self, **kwargs ):
+        Host.config( self, **kwargs )
+        mtu = "ifconfig " + self.name + "-eth0 mtu 1490"
+        self.cmd( mtu )
+        self.cmd( 'ip route add default via %s' % self.gateway )
 
-def config(opts):
+
+def config( opts ):
     spine = opts.spine
     leaf = opts.leaf
-    fanout = opts.fanout 
-    controllers= [ os.environ['OC%s' % i] for i in range(1,opts.onos+1) ] if (opts.onos) else ['127.0.0.1']
-    topo = LeafAndSpine(spine=spine, leaf=leaf, fanout=fanout)
-    net = Mininet(topo=topo, link=TCLink, build=False,
-                  switch=UserSwitch,
-                  controller = None,
-                  autoSetMacs = True)
+    fanout = opts.fanout
+    controllers = [ os.environ[ 'OC%s' % i ] for i in
+                    range( 1, opts.onos + 1 ) ] if (opts.onos) else [
+        '127.0.0.1' ]
+    topo = LeafAndSpine( spine=spine, leaf=leaf, fanout=fanout )
+    net = Mininet( topo=topo, link=TCLink, build=False,
+                   switch=UserSwitch,
+                   controller=None,
+                   autoSetMacs=True )
     i = 0
     for ip in controllers:
-        net.addController( "c%s" % (i), controller=RemoteController, ip=ip)
+        net.addController( "c%s" % (i), controller=RemoteController, ip=ip )
         i += 1;
-    net.build()
-    net.start()
-    CLI(net)
-    net.stop()
+    net.build( )
+    net.start( )
+    CLI( net )
+    net.stop( )
+
 
 if __name__ == '__main__':
-    setLogLevel('info')
-    config(opts)
-    os.system('sudo mn -c')
-
+    setLogLevel( 'info' )
+    config( opts )
+    os.system( 'sudo mn -c' )