Use print function

mininet/cli.py

@@ -25,6 +25,7 @@ list all nodes ('nodes'), to print out the network topology
 and bandwidth ('iperf'.)
 """
 
+from __future__ import print_function
 from subprocess import call
 from cmd import Cmd
 from os import isatty
@@ -371,7 +372,7 @@ class CLI( Cmd ):
     def do_links( self, _line ):
         "Report on links"
         for link in self.mn.links:
-            print link, link.status()
+            print( link, link.status() )
 
     def do_switch( self, line ):
         "Starts or stops a switch"
@@ -405,7 +406,7 @@ class CLI( Cmd ):
 
         if first in self.mn:
             if not args:
-                print "*** Enter a command for node: %s <cmd>" % first
+                print( "*** Enter a command for node: %s <cmd>" % first )
                 return
             node = self.mn[ first ]
             rest = args.split( ' ' )

mininet/util.py

@@ -1,5 +1,7 @@
 "Utility functions for Mininet."
 
+from __future__ import print_function
+
 from mininet.log import output, info, error, warn, debug
 
 from time import sleep
@@ -587,7 +589,7 @@ def ensureRoot():
     Probably we should only sudo when needed as per Big Switch's patch.
     """
     if os.getuid() != 0:
-        print "*** Mininet must run as root."
+        print( "*** Mininet must run as root." )
         exit( 1 )
     return