diff --git a/TestON/tests/USECASE/SegmentRouting/SRLinkFailure/SRLinkFailure.py b/TestON/tests/USECASE/SegmentRouting/SRLinkFailure/SRLinkFailure.py
index 025384e..b388a64 100755
--- a/TestON/tests/USECASE/SegmentRouting/SRLinkFailure/SRLinkFailure.py
+++ b/TestON/tests/USECASE/SegmentRouting/SRLinkFailure/SRLinkFailure.py
@@ -1,11 +1,10 @@
-#In this test we perform a link failure and then test for connectivity
-#CASE1: 2x2 topo + link failure + IP connectivity test
-#CASE2: 4x4 topo + link failure + IP connectivity test
-#CASE4: 2x2 topo + 3-node ONOS CLUSTER + link failure + IP connectivity test
-#CASE5: 4x4 topo + 3-node ONOS CLUSTER + link failure + IP connectivity test
+# In this test we perform a link failure and then test for connectivity
+# CASE1: 2x2 topo + link failure + IP connectivity test
+# CASE2: 4x4 topo + link failure + IP connectivity test
+# CASE4: 2x2 topo + 3-node ONOS CLUSTER + link failure + IP connectivity test
+# CASE5: 4x4 topo + 3-node ONOS CLUSTER + link failure + IP connectivity test
 
 class SRLinkFailure:
-
     def __init__( self ):
         self.default = ''
 
@@ -17,8 +16,9 @@
         Cause link failure
         Pingall
         """
-        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import Testcaselib as run
-        if not hasattr( main,'apps' ):
+        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import \
+            Testcaselib as run
+        if not hasattr( main, 'apps' ):
             run.initTest( main )
 
         description = "Bridging and Routing sanity test with 2x2 Leaf-spine "
@@ -28,20 +28,20 @@
         main.numCtrls = 1
         run.installOnos( main )
         run.startMininet( main, 'cord_fabric.py' )
-        #pre-configured routing and bridging test
+        # pre-configured routing and bridging test
         run.checkFlows( main, minFlowCount=116 )
         run.pingAll( main )
-        #link failure
+        # link failure
         run.killLink( main, 'spine101', 'leaf2', switches='4', links='6' )
         run.pingAll( main, "CASE1_Failure" )
-        run.restoreLink( main, 'spine101', 'leaf2','of:0000000000000101',
-                        'of:0000000000000002', '2', '1', '4', '8' )
+        run.restoreLink( main, 'spine101', 'leaf2', 'of:0000000000000101',
+                         'of:0000000000000002', '2', '1', '4', '8' )
         run.pingAll( main, "CASE1_Recovery" )
-        #TODO Dynamic config of hosts in subnet
-        #TODO Dynamic config of host not in subnet
-        #TODO Dynamic config of vlan xconnect
-        #TODO Vrouter integration
-        #TODO Mcast integration
+        # TODO Dynamic config of hosts in subnet
+        # TODO Dynamic config of host not in subnet
+        # TODO Dynamic config of vlan xconnect
+        # TODO Vrouter integration
+        # TODO Mcast integration
         run.cleanup( main )
 
     def CASE2( self, main ):
@@ -52,8 +52,9 @@
         Cause link failure
         Pingall
         """
-        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import Testcaselib as run
-        if not hasattr( main,'apps' ):
+        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import \
+            Testcaselib as run
+        if not hasattr( main, 'apps' ):
             run.initTest( main )
         description = "Bridging and Routing sanity test with 4x4 Leaf-spine "
         main.case( description )
@@ -61,20 +62,20 @@
         main.numCtrls = 1
         run.installOnos( main )
         run.startMininet( main, 'cord_fabric.py', args="--leaf=4 --spine=4" )
-        #pre-configured routing and bridging test
+        # pre-configured routing and bridging test
         run.checkFlows( main, minFlowCount=350 )
         run.pingAll( main )
-        #link failure
+        # link failure
         run.killLink( main, 'spine101', 'leaf2', switches='8', links='30' )
         run.pingAll( main, "CASE2_Failure" )
-        run.restoreLink( main, 'spine101', 'leaf2','of:0000000000000101',
-                    'of:0000000000000002', '2', '1', '8', '32' )
+        run.restoreLink( main, 'spine101', 'leaf2', 'of:0000000000000101',
+                         'of:0000000000000002', '2', '1', '8', '32' )
         run.pingAll( main, "CASE2_Recovery" )
-        #TODO Dynamic config of hosts in subnet
-        #TODO Dynamic config of host not in subnet
-        #TODO preconfigured xconnect
-        #TODO Vrouter integration
-        #TODO Mcast integration
+        # TODO Dynamic config of hosts in subnet
+        # TODO Dynamic config of host not in subnet
+        # TODO preconfigured xconnect
+        # TODO Vrouter integration
+        # TODO Mcast integration
         run.cleanup( main )
 
     def CASE4( self, main ):
@@ -85,8 +86,9 @@
         Cause link failure
         Pingall
         """
-        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import Testcaselib as run
-        if not hasattr( main,'apps' ):
+        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import \
+            Testcaselib as run
+        if not hasattr( main, 'apps' ):
             run.initTest( main )
         description = "Bridging and Routing sanity test with 2x2 Leaf-spine "
         main.case( description )
@@ -94,20 +96,20 @@
         main.numCtrls = 3
         run.installOnos( main )
         run.startMininet( main, 'cord_fabric.py' )
-        #pre-configured routing and bridging test
+        # pre-configured routing and bridging test
         run.checkFlows( main, minFlowCount=116 )
         run.pingAll( main )
-        #link failure
+        # link failure
         run.killLink( main, 'spine101', 'leaf2', switches='4', links='6' )
         run.pingAll( main, "CASE3_Failure" )
-        run.restoreLink( main, 'spine101', 'leaf2','of:0000000000000101',
-                        'of:0000000000000002', '2', '1', '4', '8' )
+        run.restoreLink( main, 'spine101', 'leaf2', 'of:0000000000000101',
+                         'of:0000000000000002', '2', '1', '4', '8' )
         run.pingAll( main, "CASE3_Recovery" )
-        #TODO Dynamic config of hosts in subnet
-        #TODO Dynamic config of host not in subnet
-        #TODO Dynamic config of vlan xconnect
-        #TODO Vrouter integration
-        #TODO Mcast integration
+        # TODO Dynamic config of hosts in subnet
+        # TODO Dynamic config of host not in subnet
+        # TODO Dynamic config of vlan xconnect
+        # TODO Vrouter integration
+        # TODO Mcast integration
         run.cleanup( main )
 
     def CASE5( self, main ):
@@ -118,8 +120,9 @@
         Cause link failure
         Pingall
         """
-        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import Testcaselib as run
-        if not hasattr( main,'apps' ):
+        from tests.USECASE.SegmentRouting.dependencies.Testcaselib import \
+            Testcaselib as run
+        if not hasattr( main, 'apps' ):
             run.initTest( main )
         description = "Bridging and Routing sanity test with 4x4 Leaf-spine "
         main.case( description )
@@ -127,18 +130,18 @@
         main.numCtrls = 3
         run.installOnos( main )
         run.startMininet( main, 'cord_fabric.py', args="--leaf=4 --spine=4" )
-        #pre-configured routing and bridging test
+        # pre-configured routing and bridging test
         run.checkFlows( main, minFlowCount=350 )
         run.pingAll( main )
-        #link failure
+        # link failure
         run.killLink( main, 'spine101', 'leaf2', switches='8', links='30' )
         run.pingAll( main, "CASE2_Failure" )
-        run.restoreLink( main, 'spine101', 'leaf2','of:0000000000000101',
-                        'of:0000000000000002', '2', '1', '8', '32' )
+        run.restoreLink( main, 'spine101', 'leaf2', 'of:0000000000000101',
+                         'of:0000000000000002', '2', '1', '8', '32' )
         run.pingAll( main, "CASE2_Recovery" )
-        #TODO Dynamic config of hosts in subnet
-        #TODO Dynamic config of host not in subnet
-        #TODO preconfigured xconnect
-        #TODO Vrouter integration
-        #TODO Mcast integration
+        # TODO Dynamic config of hosts in subnet
+        # TODO Dynamic config of host not in subnet
+        # TODO preconfigured xconnect
+        # TODO Vrouter integration
+        # TODO Mcast integration
         run.cleanup( main )