toolchain-utils: fix missing-print-function lint warnings.

BUG=chromium:570458
TEST='crosperf/run_tests.sh' passes.

Change-Id: I2e0cf0d903b0ca7662132528ee6860ea8eaee83b
Reviewed-on: https://chrome-internal-review.googlesource.com/243412
Commit-Ready: Rahul Chaudhry <rahulchaudhry@google.com>
Tested-by: Rahul Chaudhry <rahulchaudhry@google.com>
Reviewed-by: Caroline Tice <cmtice@google.com>

27 files changed, 111 insertions, 54 deletions

diff --git a/binary_search_tool/cros_pkg/cros_pkg_create_cleanup_script.py b/binary_search_tool/cros_pkg/cros_pkg_create_cleanup_script.py
index 640ca658..3fc1bb61 100755
--- a/binary_search_tool/cros_pkg/cros_pkg_create_cleanup_script.py
+++ b/binary_search_tool/cros_pkg/cros_pkg_create_cleanup_script.py
@@ -9,12 +9,14 @@
 #  original state.
 #
 
+from __future__ import print_function
+
 import argparse
 import sys
 
 
 def Usage(parser, msg):
-  print 'ERROR: ' + msg
+  print('ERROR: ' + msg)
   parser.print_help()
   sys.exit(1)
 
diff --git a/binary_search_tool/cros_pkg/cros_pkg_undo_eclean.py b/binary_search_tool/cros_pkg/cros_pkg_undo_eclean.py
index cd7b2c89..ed934c47 100755
--- a/binary_search_tool/cros_pkg/cros_pkg_undo_eclean.py
+++ b/binary_search_tool/cros_pkg/cros_pkg_undo_eclean.py
@@ -10,6 +10,8 @@
 # output file, in effect commenting out any lines that contain 'eclean'.
 #
 
+from __future__ import print_function
+
 import sys
 import os
 
diff --git a/binary_search_tool/test/binary_search_tool_tester.py b/binary_search_tool/test/binary_search_tool_tester.py
index 20defe2f..72816790 100755
--- a/binary_search_tool/test/binary_search_tool_tester.py
+++ b/binary_search_tool/test/binary_search_tool_tester.py
@@ -3,6 +3,8 @@
 # Copyright 2012 Google Inc. All Rights Reserved.
 """Tests for bisecting tool."""
 
+from __future__ import print_function
+
 __author__ = 'shenhan@google.com (Han Shen)'
 
 import os
@@ -31,8 +33,8 @@ class BisectingUtilsTest(unittest.TestCase):
     """Cleanup temp files."""
     os.remove(common.OBJECTS_FILE)
     os.remove(common.WORKING_SET_FILE)
-    print 'Deleted "{0}" and "{1}"'.format(common.OBJECTS_FILE,
-                                           common.WORKING_SET_FILE)
+    print('Deleted "{0}" and "{1}"'.format(common.OBJECTS_FILE,
+                                           common.WORKING_SET_FILE))
 
   def runTest(self):
     args = ['--get_initial_items', './gen_init_list.py', '--switch_to_good',
diff --git a/binary_search_tool/test/gen_init_list.py b/binary_search_tool/test/gen_init_list.py
index c1348119..e840973c 100755
--- a/binary_search_tool/test/gen_init_list.py
+++ b/binary_search_tool/test/gen_init_list.py
@@ -1,6 +1,8 @@
 #!/usr/bin/python2
 """Prints out index for every object file, starting from 0."""
 
+from __future__ import print_function
+
 import sys
 
 from utils import command_executer
@@ -12,7 +14,7 @@ def Main():
   _, l, _ = ce.RunCommandWOutput('cat {0} | wc -l'.format(common.OBJECTS_FILE),
                                  print_to_console=False)
   for i in range(0, int(l)):
-    print i
+    print(i)
 
 
 if __name__ == '__main__':
diff --git a/binary_search_tool/test/switch_to_bad.py b/binary_search_tool/test/switch_to_bad.py
index 25f76304..b8602421 100755
--- a/binary_search_tool/test/switch_to_bad.py
+++ b/binary_search_tool/test/switch_to_bad.py
@@ -1,6 +1,8 @@
 #!/usr/bin/python2
 """Switch part of the objects file in working set to (possible) bad ones."""
 
+from __future__ import print_function
+
 import sys
 
 import common
diff --git a/crosperf/crosperf.py b/crosperf/crosperf.py
index 2466ac6c..cc2c9010 100755
--- a/crosperf/crosperf.py
+++ b/crosperf/crosperf.py
@@ -3,6 +3,8 @@
 # Copyright 2011 Google Inc. All Rights Reserved.
 """The driver script for running performance benchmarks on ChromeOS."""
 
+from __future__ import print_function
+
 import atexit
 import optparse
 import os
diff --git a/crosperf/experiment_runner_unittest.py b/crosperf/experiment_runner_unittest.py
index fe5733e4..320c5014 100755
--- a/crosperf/experiment_runner_unittest.py
+++ b/crosperf/experiment_runner_unittest.py
@@ -1,6 +1,9 @@
 #!/usr/bin/python2
 #
 # Copyright 2014 Google Inc. All Rights Reserved
+
+from __future__ import print_function
+
 import StringIO
 import getpass
 import os
diff --git a/crosperf/machine_manager_unittest.py b/crosperf/machine_manager_unittest.py
index f0084a0d..440f9bba 100755
--- a/crosperf/machine_manager_unittest.py
+++ b/crosperf/machine_manager_unittest.py
@@ -2,6 +2,9 @@
 
 # Copyright 2012 Google Inc. All Rights Reserved.
 """Unittest for machine_manager."""
+
+from __future__ import print_function
+
 import os.path
 import time
 import hashlib
diff --git a/crosperf/suite_runner.py b/crosperf/suite_runner.py
index 527aa984..b76f85e9 100644
--- a/crosperf/suite_runner.py
+++ b/crosperf/suite_runner.py
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from __future__ import print_function
+
 import os
 import time
 import shlex
diff --git a/utils/buildbot_json.py b/utils/buildbot_json.py
index cf8fcb30..825ac8a5 100755
--- a/utils/buildbot_json.py
+++ b/utils/buildbot_json.py
@@ -31,6 +31,8 @@
 """Queries buildbot through the json interface.
 """
 
+from __future__ import print_function
+
 __author__ = 'maruel@chromium.org'
 __version__ = '1.2'
 
@@ -1033,15 +1035,15 @@ def CMDpending(parser, args):
     pending_builds = builder.data.get('pendingBuilds', 0)
     if not pending_builds:
       continue
-    print 'Builder %s: %d' % (builder.name, pending_builds)
+    print('Builder %s: %d' % (builder.name, pending_builds))
     if not options.quiet:
       for pending in builder.pending_builds.data:
         if 'revision' in pending['source']:
-          print '  revision: %s' % pending['source']['revision']
+          print('  revision: %s' % pending['source']['revision'])
         for change in pending['source']['changes']:
-          print '  change:'
-          print '    comment: %r' % unicode(change['comments'][:50])
-          print '    who:     %s' % change['who']
+          print('  change:')
+          print('    comment: %r' % unicode(change['comments'][:50]))
+          print('    who:     %s' % change['who'])
   return 0
 
 
@@ -1108,7 +1110,7 @@ def CMDdisconnected(parser, args):
     parser.error('Unrecognized parameters: %s' % ' '.join(args))
   for slave in buildbot.slaves:
     if not slave.connected:
-      print slave.name
+      print(slave.name)
   return 0
 
 
@@ -1146,10 +1148,10 @@ def find_idle_busy_slaves(parser, args, show_idle):
       slaves = natsorted(set(slaves) & set(busy_slaves))
     if options.quiet:
       for slave in slaves:
-        print slave
+        print(slave)
     else:
       if slaves:
-        print 'Builder %s: %s' % (builder.name, ', '.join(slaves))
+        print('Builder %s: %s' % (builder.name, ', '.join(slaves)))
   return 0
 
 
@@ -1241,20 +1243,20 @@ def CMDlast_failure(parser, args):
                             no_cache=options.no_cache):
 
     if print_builders and last_builder != build.builder:
-      print build.builder.name
+      print(build.builder.name)
       last_builder = build.builder
 
     if options.quiet:
       if options.slaves:
-        print '%s: %s' % (build.builder.name, build.slave.name)
+        print('%s: %s' % (build.builder.name, build.slave.name))
       else:
-        print build.slave.name
+        print(build.slave.name)
     else:
       out = '%d on %s: blame:%s' % (build.number, build.slave.name,
                                     ', '.join(build.blame))
       if print_builders:
         out = '  ' + out
-      print out
+      print(out)
 
       if len(options.steps) != 1:
         for step in build.steps:
@@ -1264,7 +1266,7 @@ def CMDlast_failure(parser, args):
             out = '  %s: "%s"' % (step.data['name'], summary)
             if print_builders:
               out = '  ' + out
-            print out
+            print(out)
   return 0
 
 
@@ -1293,16 +1295,16 @@ def CMDcurrent(parser, args):
         if build.blame:
           for blamed in build.blame:
             blame.add(blamed)
-    print '\n'.join(blame)
+    print('\n'.join(blame))
     return 0
 
   for builder in options.builders:
     builder = buildbot.builders[builder]
     if not options.quiet and builder.current_builds:
-      print builder.name
+      print(builder.name)
     for build in builder.current_builds:
       if options.quiet:
-        print build.slave.name
+        print(build.slave.name)
       else:
         out = '%4d: slave=%10s' % (build.number, build.slave.name)
         out += '  duration=%5d' % (build.duration or 0)
@@ -1312,7 +1314,7 @@ def CMDcurrent(parser, args):
           out += '           '
         if build.blame:
           out += '  blame=' + ', '.join(build.blame)
-        print out
+        print(out)
 
   return 0
 
@@ -1359,9 +1361,9 @@ def CMDbuilds(parser, args):
             out += '%s/' % build.slave.name
           out += '%d  revision:%s  result:%s  blame:%s' % (
               build.number, build.revision, build.result, ','.join(build.blame))
-          print out
+          print(out)
         else:
-          print build
+          print(build)
   return 0
 
 
@@ -1393,27 +1395,27 @@ def CMDcount(parser, args):
     builder = buildbot.builders[builder]
     counts[builder.name] = 0
     if not options.quiet:
-      print builder.name
+      print(builder.name)
     for build in builder.builds.iterall():
       try:
         start_time = build.start_time
       except urllib2.HTTPError:
         # The build was probably trimmed.
-        print >> sys.stderr, ('Failed to fetch build %s/%d' %
-                              (builder.name, build.number))
+        print('Failed to fetch build %s/%d' % (builder.name, build.number),
+              file=sys.stderr)
         continue
       if start_time >= since:
         counts[builder.name] += 1
       else:
         break
     if not options.quiet:
-      print '.. %d' % counts[builder.name]
+      print('.. %d' % counts[builder.name])
 
   align_name = max(len(b) for b in counts)
   align_number = max(len(str(c)) for c in counts.itervalues())
   for builder in sorted(counts):
-    print '%*s: %*d' % (align_name, builder, align_number, counts[builder])
-  print 'Total: %d' % sum(counts.itervalues())
+    print('%*s: %*d' % (align_name, builder, align_number, counts[builder]))
+  print('Total: %d' % sum(counts.itervalues()))
   return 0
 
 
diff --git a/utils/buildbot_utils.py b/utils/buildbot_utils.py
index f95f2e8b..8f83c972 100644
--- a/utils/buildbot_utils.py
+++ b/utils/buildbot_utils.py
@@ -2,6 +2,8 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+from __future__ import print_function
+
 import os
 import time
 import urllib2
@@ -96,7 +98,7 @@ def FindBuildRecordFromLog(description, log_info):
         # We found a match; we're done.
         return my_dict
     except:
-      print "reason is not in dictionary: '%s'" % repr(my_dict)
+      print("reason is not in dictionary: '%s'" % repr(my_dict))
     else:
       # Keep going.
       continue
diff --git a/utils/command_executer.py b/utils/command_executer.py
index a7131ef2..423eded2 100644
--- a/utils/command_executer.py
+++ b/utils/command_executer.py
@@ -3,6 +3,8 @@
 # found in the LICENSE file.
 """Utilities to run commands in outside/inside chroot and on the board."""
 
+from __future__ import print_function
+
 import getpass
 import os
 import re
diff --git a/utils/command_executer_unittest.py b/utils/command_executer_unittest.py
index cf5bf683..6922febe 100755
--- a/utils/command_executer_unittest.py
+++ b/utils/command_executer_unittest.py
@@ -1,5 +1,8 @@
 #!/usr/bin/python2
 """Unittest for command_executer.py."""
+
+from __future__ import print_function
+
 import time
 import unittest
 
diff --git a/utils/email_sender.py b/utils/email_sender.py
index 3300867a..1ae701ef 100755
--- a/utils/email_sender.py
+++ b/utils/email_sender.py
@@ -3,6 +3,8 @@
 # Copyright 2011 Google Inc. All Rights Reserved.
 """Utilities to send email either through SMTP or SendGMR."""
 
+from __future__ import print_function
+
 from email import Encoders
 from email.MIMEBase import MIMEBase
 from email.MIMEMultipart import MIMEMultipart
diff --git a/utils/file_utils.py b/utils/file_utils.py
index cb2e417f..a9a84d5a 100644
--- a/utils/file_utils.py
+++ b/utils/file_utils.py
@@ -1,5 +1,7 @@
 # Copyright 2011 Google Inc. All Rights Reserved.
 
+from __future__ import print_function
+
 import errno
 import os
 import shutil
diff --git a/utils/locks.py b/utils/locks.py
index 5d865710..ef224ee7 100644
--- a/utils/locks.py
+++ b/utils/locks.py
@@ -1,6 +1,8 @@
 # Copyright 2015 The Chromium OS Authors. All rights reserved.
 """Utilities for locking machines."""
 
+from __future__ import print_function
+
 import time
 
 import afe_lock_machine
diff --git a/utils/logger.py b/utils/logger.py
index 147f359d..8006d4b9 100644
--- a/utils/logger.py
+++ b/utils/logger.py
@@ -1,5 +1,7 @@
 # Copyright 2010 Google Inc. All Rights Reserved.
 
+from __future__ import print_function
+
 # System modules
 import os.path
 import sys
@@ -26,7 +28,7 @@ class Logger(object):
       os.makedirs(logdir)
     except OSError:
       pass
-      # print "Warning: Logs directory '%s' already exists." % logdir
+      # print("Warning: Logs directory '%s' already exists." % logdir)
 
     self.print_console = print_console
 
@@ -63,7 +65,7 @@ class Logger(object):
     try:
       fd = open(name, 'w')
     except IOError:
-      print 'Warning: could not open %s for writing.' % name
+      print('Warning: could not open %s for writing.' % name)
     return fd
 
   def _CreateLogFileHandles(self, basename):
@@ -86,7 +88,7 @@ class Logger(object):
           os.remove(dest_file)
         os.symlink(src_file, dest_file)
     except Exception as ex:
-      print 'Exception while creating symlinks: %s' % str(ex)
+      print('Exception while creating symlinks: %s' % str(ex))
 
   def _WriteTo(self, fd, msg, flush):
     if fd:
@@ -231,15 +233,15 @@ class MockLogger(object):
     return suffix
 
   def _CreateLogFileHandle(self, name):
-    print 'MockLogger: creating open file handle for %s (writing)' % name
+    print('MockLogger: creating open file handle for %s (writing)' % name)
 
   def _CreateLogFileHandles(self, basename):
     suffix = self._FindSuffix(basename)
     suffixed_basename = self._AddSuffix(basename, suffix)
 
-    print 'MockLogger: opening file %s.cmd' % suffixed_basename
-    print 'MockLogger: opening file %s.out' % suffixed_basename
-    print 'MockLogger: opening file %s.err' % suffixed_basename
+    print('MockLogger: opening file %s.cmd' % suffixed_basename)
+    print('MockLogger: opening file %s.out' % suffixed_basename)
+    print('MockLogger: opening file %s.err' % suffixed_basename)
 
     self._CreateLogFileSymlinks(basename, suffixed_basename)
 
@@ -248,22 +250,22 @@ class MockLogger(object):
     for extension in ['cmd', 'out', 'err']:
       src_file = '%s.%s' % (os.path.basename(suffixed_basename), extension)
       dest_file = '%s.%s' % (basename, extension)
-      print 'MockLogger: Calling os.symlink(%s, %s)' % (src_file, dest_file)
+      print('MockLogger: Calling os.symlink(%s, %s)' % (src_file, dest_file))
 
   def _WriteTo(self, fd, msg, flush):
-    print 'MockLogger: %s' % msg
+    print('MockLogger: %s' % msg)
 
   def LogStartDots(self, print_to_console=True):
-    print '. '
+    print('. ')
 
   def LogAppendDot(self, print_to_console=True):
-    print '. '
+    print('. ')
 
   def LogEndDots(self, print_to_console=True):
-    print '\n'
+    print('\n')
 
   def LogMsg(self, file_fd, term_fd, msg, flush=True):
-    print 'MockLogger: %s' % msg
+    print('MockLogger: %s' % msg)
 
   def _GetStdout(self, print_to_console):
     #    if print_to_console:
@@ -280,7 +282,7 @@ class MockLogger(object):
 
     host = ('%s@%s' % (user, machine)) if user else machine
     cmd_string = 'CMD (%s): %s\n' % (host, cmd)
-    print 'MockLogger: Writing to file ONLY: %s' % cmd_string
+    print('MockLogger: Writing to file ONLY: %s' % cmd_string)
 
   def LogCmd(self, cmd, machine='', user=None, print_to_console=True):
     if user:
@@ -295,7 +297,7 @@ class MockLogger(object):
     self.LogMsg(0, self._GetStderr(print_to_console), 'FATAL: %s\n' % msg)
     self.LogMsg(0, self._GetStderr(print_to_console),
                 '\n'.join(traceback.format_stack()))
-    print 'MockLogger: Calling sysexit(1)'
+    print('MockLogger: Calling sysexit(1)')
 
   def LogError(self, msg, print_to_console=True):
     self.LogMsg(0, self._GetStderr(print_to_console), 'ERROR: %s\n' % msg)
@@ -331,7 +333,7 @@ class MockLogger(object):
                 flush=False)
 
   def Flush(self):
-    print 'MockLogger: Flushing cmdfd, stdout, stderr'
+    print('MockLogger: Flushing cmdfd, stdout, stderr')
 
 
 main_logger = None
diff --git a/utils/machines.py b/utils/machines.py
index 1973e656..73aa96ad 100644
--- a/utils/machines.py
+++ b/utils/machines.py
@@ -3,6 +3,8 @@
 # found in the LICENSE file.
 """Utilities relating to machine-specific functions."""
 
+from __future__ import print_function
+
 from utils import command_executer
 
 
diff --git a/utils/manifest_versions.py b/utils/manifest_versions.py
index c09ac00c..f011282b 100644
--- a/utils/manifest_versions.py
+++ b/utils/manifest_versions.py
@@ -3,6 +3,8 @@
 # found in the LICENSE file.
 """Tools for searching/manipulating the manifests repository."""
 
+from __future__ import print_function
+
 __author__ = 'llozano@google.com (Luis Lozano)'
 
 import os
diff --git a/utils/misc.py b/utils/misc.py
index ecc0b1a5..90d41b2e 100644
--- a/utils/misc.py
+++ b/utils/misc.py
@@ -3,6 +3,8 @@
 # found in the LICENSE file.
 """Utilities for toolchain build."""
 
+from __future__ import print_function
+
 __author__ = 'asharif@google.com (Ahmad Sharif)'
 
 from contextlib import contextmanager
@@ -428,7 +430,7 @@ def DeleteChromeOsTree(chromeos_root, dry_run=False):
     return False
   cmd0 = 'cd {0} && cros_sdk --delete'.format(chromeos_root)
   if dry_run:
-    print cmd0
+    print(cmd0)
   else:
     if command_executer.GetCommandExecuter().RunCommand(
         cmd0,
@@ -440,7 +442,7 @@ def DeleteChromeOsTree(chromeos_root, dry_run=False):
           'cd $CHROMEOSDIRNAME && sudo rm -fr $CHROMEOSBASENAME').format(
               chromeos_root)
   if dry_run:
-    print cmd1
+    print(cmd1)
     return True
 
   return command_executer.GetCommandExecuter().RunCommand(
diff --git a/utils/misc_test.py b/utils/misc_test.py
index 06cf2f92..418068bf 100644
--- a/utils/misc_test.py
+++ b/utils/misc_test.py
@@ -1,6 +1,8 @@
 # Copyright 2012 Google Inc. All Rights Reserved.
 """Tests for misc."""
 
+from __future__ import print_function
+
 __author__ = 'asharif@google.com (Ahmad Sharif)'
 
 # System modules
diff --git a/utils/no_pseudo_terminal_test.py b/utils/no_pseudo_terminal_test.py
index 209840f1..fd349e87 100644
--- a/utils/no_pseudo_terminal_test.py
+++ b/utils/no_pseudo_terminal_test.py
@@ -1,5 +1,7 @@
 """Test to ensure we're not touching /dev/ptmx when running commands."""
 
+from __future__ import print_function
+
 import os
 import subprocess
 import tempfile
@@ -15,7 +17,7 @@ class NoPsuedoTerminalTest(unittest.TestCase):
   def _AttachStraceToSelf(self, output_file):
     """Attaches strace to the current process."""
     args = ['strace', '-o', output_file, '-p', str(os.getpid())]
-    print args
+    print(args)
     self._strace_process = subprocess.Popen(args)
     # Wait until we see some activity.
     start_time = time.time()
diff --git a/utils/perf_diff.py b/utils/perf_diff.py
index 46d46a3a..3e390b2c 100755
--- a/utils/perf_diff.py
+++ b/utils/perf_diff.py
@@ -5,6 +5,8 @@
 A detailed description of perf_diff.
 """
 
+from __future__ import print_function
+
 __author__ = 'asharif@google.com (Ahmad Sharif)'
 
 import optparse
@@ -85,7 +87,7 @@ class Tabulator(object):
           row.append('0')
       table.append(row)
 
-    print tabulator.GetSimpleTable(table)
+    print(tabulator.GetSimpleTable(table))
 
 
 class Function(object):
diff --git a/utils/tabulator.py b/utils/tabulator.py
index 23bbca22..78c84f5d 100644
--- a/utils/tabulator.py
+++ b/utils/tabulator.py
@@ -60,6 +60,8 @@ table:
 
 """
 
+from __future__ import print_function
+
 import getpass
 import math
 import sys
@@ -915,7 +917,7 @@ class TableFormatter(object):
       for cell in row:
         o += str(cell) + ' '
       o += '\n'
-    print o
+    print(o)
 
   def GetCellTable(self, table_type, headers=True):
     """Function to return a table of cells.
@@ -1203,13 +1205,13 @@ if __name__ == '__main__':
                                           'k9': 'PASS'}]]
   labels = ['vanilla', 'modified']
   t = GetComplexTable(runs, labels, TablePrinter.CONSOLE)
-  print t
+  print(t)
   email = GetComplexTable(runs, labels, TablePrinter.EMAIL)
 
   runs = [[{'k1': '1'}, {'k1': '1.1'}, {'k1': '1.2'}],
           [{'k1': '5'}, {'k1': '5.1'}, {'k1': '5.2'}]]
   t = GetComplexTable(runs, labels, TablePrinter.CONSOLE)
-  print t
+  print(t)
 
   simple_table = [
       ['binary', 'b1', 'b2', 'b3'],
@@ -1219,7 +1221,7 @@ if __name__ == '__main__':
       ['debug', 100, 140, 60],
   ]
   t = GetSimpleTable(simple_table)
-  print t
+  print(t)
   email += GetSimpleTable(simple_table, TablePrinter.HTML)
   email_to = [getpass.getuser()]
   email = "<pre style='font-size: 13px'>%s</pre>" % email
diff --git a/utils/tabulator_test.py b/utils/tabulator_test.py
index b46fcc1f..461c2877 100644
--- a/utils/tabulator_test.py
+++ b/utils/tabulator_test.py
@@ -1,6 +1,8 @@
 # Copyright 2012 Google Inc. All Rights Reserved.
 """Tests for the tabulator module."""
 
+from __future__ import print_function
+
 __author__ = 'asharif@google.com (Ahmad Sharif)'
 
 # System modules
diff --git a/utils/timeline.py b/utils/timeline.py
index 8fa73a2d..84c8be85 100644
--- a/utils/timeline.py
+++ b/utils/timeline.py
@@ -2,6 +2,8 @@
 #
 """Tools for recording and reporting timeline of benchmark_run."""
 
+from __future__ import print_function
+
 __author__ = 'yunlian@google.com (Yunlian Jiang)'
 
 import time
diff --git a/utils/timeline_test.py b/utils/timeline_test.py
index 17482c2b..866d119c 100644
--- a/utils/timeline_test.py
+++ b/utils/timeline_test.py
@@ -1,6 +1,8 @@
 # Copyright 2012 Google Inc. All Rights Reserved.
 """Tests for time_line.py."""
 
+from __future__ import print_function
+
 __author__ = 'yunlian@google.com (Yunlian Jiang)'
 
 import time