From d8c30910cb284956229099640abd252dc5a0527d Mon Sep 17 00:00:00 2001
From: lantz <rlantz@cs.stanford.edu>
Date: Sat, 9 Jan 2021 21:15:27 -0800
Subject: [PATCH] ubuntu 14 code check fixes so travis can pass (#1006)

---
 examples/treeping64.py           | 4 +---
 mininet/cli.py                   | 2 +-
 mininet/nodelib.py               | 2 --
 mininet/test/test_walkthrough.py | 4 ++--
 4 files changed, 4 insertions(+), 8 deletions(-)

diff --git a/examples/treeping64.py b/examples/treeping64.py
index 35beec8..c72943c 100755
--- a/examples/treeping64.py
+++ b/examples/treeping64.py
@@ -4,7 +4,7 @@
 
 
 from mininet.log import setLogLevel, info
-from mininet.node import UserSwitch, OVSKernelSwitch, Host, Controller
+from mininet.node import UserSwitch, OVSKernelSwitch, Host
 from mininet.topolib import TreeNet
 
 
@@ -18,8 +18,6 @@ class HostV4( Host ):
             self.cmd( 'sysctl -w net.ipv6.conf.' + cfg )
 
 
-
-
 def treePing64():
     "Run ping test on 64-node tree networks."
 
diff --git a/mininet/cli.py b/mininet/cli.py
index be20ca8..5c644ca 100644
--- a/mininet/cli.py
+++ b/mininet/cli.py
@@ -399,7 +399,7 @@ class CLI( Cmd ):
                 error( 'invalid command: '
                        'switch <switch name> {start, stop}\n' )
 
-    def do_wait( self, line ):
+    def do_wait( self, _line ):
         "Wait until all switches have connected to a controller"
         self.mn.waitConnected()
 
diff --git a/mininet/nodelib.py b/mininet/nodelib.py
index 02fbf00..1d5106e 100644
--- a/mininet/nodelib.py
+++ b/mininet/nodelib.py
@@ -136,8 +136,6 @@ class NAT( Node ):
         # Instruct the kernel to perform forwarding
         self.cmd( 'sysctl net.ipv4.ip_forward=1' )
 
-
-
     def terminate( self ):
         "Stop NAT/forwarding between Mininet and external network"
         # Remote NAT rules
diff --git a/mininet/test/test_walkthrough.py b/mininet/test/test_walkthrough.py
index f418d2d..2b26e18 100755
--- a/mininet/test/test_walkthrough.py
+++ b/mininet/test/test_walkthrough.py
@@ -29,8 +29,8 @@ class testWalkthrough( unittest.TestCase ):
 
     prompt = 'mininet>'
 
-
-    def setup( self ):
+    @staticmethod
+    def setup():
         "Be paranoid and run cleanup() before each test"
         cleanup()