Use print function

examples/cluster.py

@@ -74,6 +74,8 @@ Things to do:
 - hifi support (e.g. delay compensation)
 """
 
+from __future__ import print_function
+
 from mininet.node import Node, Host, OVSSwitch, Controller
 from mininet.link import Link, Intf
 from mininet.net import Mininet
@@ -238,7 +240,7 @@ class RemoteMixin( object ):
            args: string or list of strings
            returns: stdout and stderr"""
         popen = self.rpopen( *cmd, **opts )
-        # print 'RCMD: POPEN:', popen
+        # print( 'RCMD: POPEN:', popen )
         # These loops are tricky to get right.
         # Once the process exits, we can read
         # EOF twice if necessary.
@@ -792,28 +794,28 @@ def testNsTunnels():
 
 def testRemoteNet( remote='ubuntu2' ):
     "Test remote Node classes"
-    print '*** Remote Node Test'
+    print( '*** Remote Node Test' )
     net = Mininet( host=RemoteHost, switch=RemoteOVSSwitch,
                    link=RemoteLink )
     c0 = net.addController( 'c0' )
     # Make sure controller knows its non-loopback address
     Intf( 'eth0', node=c0 ).updateIP()
-    print "*** Creating local h1"
+    print( "*** Creating local h1" )
     h1 = net.addHost( 'h1' )
-    print "*** Creating remote h2"
+    print( "*** Creating remote h2" )
     h2 = net.addHost( 'h2', server=remote )
-    print "*** Creating local s1"
+    print( "*** Creating local s1" )
     s1 = net.addSwitch( 's1' )
-    print "*** Creating remote s2"
+    print( "*** Creating remote s2" )
     s2 = net.addSwitch( 's2', server=remote )
-    print "*** Adding links"
+    print( "*** Adding links" )
     net.addLink( h1, s1 )
     net.addLink( s1, s2 )
     net.addLink( h2, s2 )
     net.start()
-    print 'Mininet is running on', quietRun( 'hostname' ).strip()
+    print( 'Mininet is running on', quietRun( 'hostname' ).strip() )
     for node in c0, h1, h2, s1, s2:
-        print 'Node', node, 'is running on', node.cmd( 'hostname' ).strip()
+        print( 'Node', node, 'is running on', node.cmd( 'hostname' ).strip() )
     net.pingAll()
     CLI( net )
     net.stop()
@@ -900,9 +902,9 @@ def signalTest():
     h.shell.send_signal( SIGINT )
     h.shell.poll()
     if h.shell.returncode is None:
-        print 'OK: ', h, 'has not exited'
+        print( 'OK: ', h, 'has not exited' )
     else:
-        print 'FAILURE:', h, 'exited with code', h.shell.returncode
+        print( 'FAILURE:', h, 'exited with code', h.shell.returncode )
     h.stop()
 
 if __name__ == '__main__':