Use print function

examples/controllers2.py

@@ -11,6 +11,8 @@ Note that one could also create a custom switch class and pass it into
 the Mininet() constructor.
 """
 
+from __future__ import print_function
+
 from mininet.net import Mininet
 from mininet.node import Controller, OVSSwitch
 from mininet.cli import CLI
@@ -21,39 +23,39 @@ def multiControllerNet():
 
     net = Mininet( controller=Controller, switch=OVSSwitch )
 
-    print "*** Creating (reference) controllers"
+    print( "*** Creating (reference) controllers" )
     c1 = net.addController( 'c1', port=6633 )
     c2 = net.addController( 'c2', port=6634 )
 
-    print "*** Creating switches"
+    print( "*** Creating switches" )
     s1 = net.addSwitch( 's1' )
     s2 = net.addSwitch( 's2' )
 
-    print "*** Creating hosts"
+    print( "*** Creating hosts" )
     hosts1 = [ net.addHost( 'h%d' % n ) for n in 3, 4 ]
     hosts2 = [ net.addHost( 'h%d' % n ) for n in 5, 6 ]
 
-    print "*** Creating links"
+    print( "*** Creating links" )
     for h in hosts1:
         net.addLink( s1, h )
     for h in hosts2:
         net.addLink( s2, h )
     net.addLink( s1, s2 )
 
-    print "*** Starting network"
+    print( "*** Starting network" )
     net.build()
     c1.start()
     c2.start()
     s1.start( [ c1 ] )
     s2.start( [ c2 ] )
 
-    print "*** Testing network"
+    print( "*** Testing network" )
     net.pingAll()
 
-    print "*** Running CLI"
+    print( "*** Running CLI" )
     CLI( net )
 
-    print "*** Stopping network"
+    print( "*** Stopping network" )
     net.stop()
 
 if __name__ == '__main__':