diff --git a/tools/tutorials/sdnip/tutorial.py b/tools/tutorials/sdnip/tutorial.py
index 316690e..7a66e6b 100755
--- a/tools/tutorials/sdnip/tutorial.py
+++ b/tools/tutorials/sdnip/tutorial.py
@@ -1,5 +1,4 @@
-#!/usr/bin/python
-
+#!/usr/bin/python3
 from mininet.topo import Topo
 from mininet.net import Mininet
 from mininet.cli import CLI
@@ -36,7 +35,7 @@
         Host.config(self, **kwargs)
         self.cmd('sysctl net.ipv4.ip_forward=1')
 
-        for intf, attrs in self.intfDict.items():
+        for intf, attrs in list(self.intfDict.items()):
             self.cmd('ip addr flush dev %s' % intf)
             if 'mac' in attrs:
                 self.cmd('ip link set %s down' % intf)