Use print function

examples/treeping64.py

@@ -2,6 +2,8 @@
 
 "Create a 64-node tree network, and test connectivity using ping."
 
+from __future__ import print_function
+
 from mininet.log import setLogLevel
 from mininet.node import UserSwitch, OVSKernelSwitch  # , KernelSwitch
 from mininet.topolib import TreeNet
@@ -15,17 +17,17 @@ def treePing64():
                   'Open vSwitch kernel': OVSKernelSwitch }
 
     for name in switches:
-        print "*** Testing", name, "datapath"
+        print( "*** Testing", name, "datapath" )
         switch = switches[ name ]
         network = TreeNet( depth=2, fanout=8, switch=switch )
         result = network.run( network.pingAll )
         results[ name ] = result
 
-    print
-    print "*** Tree network ping results:"
+    print()
+    print( "*** Tree network ping results:" )
     for name in switches:
-        print "%s: %d%% packet loss" % ( name, results[ name ] )
-    print
+        print( "%s: %d%% packet loss" % ( name, results[ name ] ) )
+    print()
 
 if __name__ == '__main__':
     setLogLevel( 'info' )