diff --git a/tools/merge-event-log-tags.py b/tools/merge-event-log-tags.py
index 64bad3f..65580f6 100755
--- a/tools/merge-event-log-tags.py
+++ b/tools/merge-event-log-tags.py
@@ -24,7 +24,8 @@
 -h to display this usage message and exit.
 """
 
-import cStringIO
+from __future__ import print_function
+
 import getopt
 try:
   import hashlib
@@ -33,8 +34,20 @@
 import struct
 import sys
 
+try:
+  from cStringIO import StringIO
+except ImportError:
+  from io import StringIO
+
 import event_log_tags
 
+
+def itermitems(obj):
+  if hasattr(obj, 'iteritems'):
+    return obj.iteritems()
+  return obj.items()
+
+
 errors = []
 warnings = []
 
@@ -48,21 +61,21 @@
 
 try:
   opts, args = getopt.getopt(sys.argv[1:], "ho:m:")
-except getopt.GetoptError, err:
-  print str(err)
-  print __doc__
+except getopt.GetoptError as err:
+  print(str(err))
+  print(__doc__)
   sys.exit(2)
 
 for o, a in opts:
   if o == "-h":
-    print __doc__
+    print(__doc__)
     sys.exit(2)
   elif o == "-o":
     output_file = a
   elif o == "-m":
     pre_merged_file = a
   else:
-    print >> sys.stderr, "unhandled option %s" % (o,)
+    print("unhandled option %s" % (o,), file=sys.stderr)
     sys.exit(1)
 
 # Restrictions on tags:
@@ -133,12 +146,12 @@
 
 if errors:
   for fn, ln, msg in errors:
-    print >> sys.stderr, "%s:%d: error: %s" % (fn, ln, msg)
+    print("%s:%d: error: %s" % (fn, ln, msg), file=sys.stderr)
   sys.exit(1)
 
 if warnings:
   for fn, ln, msg in warnings:
-    print >> sys.stderr, "%s:%d: warning: %s" % (fn, ln, msg)
+    print("%s:%d: warning: %s" % (fn, ln, msg), file=sys.stderr)
 
 # Python's hash function (a) isn't great and (b) varies between
 # versions of python.  Using md5 is overkill here but is the same from
@@ -154,14 +167,14 @@
 # If we were provided pre-merged tags (w/ the -m option), then don't
 # ever try to allocate one, just fail if we don't have a number
 
-for name, t in sorted(by_tagname.iteritems()):
+for name, t in sorted(iteritems(by_tagname)):
   if t.tagnum is None:
     if pre_merged_tags:
       try:
         t.tagnum = pre_merged_tags[t.tagname]
       except KeyError:
-        print >> sys.stderr, ("Error: Tag number not defined for tag `%s'."
-            +" Have you done a full build?") % t.tagname
+        print("Error: Tag number not defined for tag `%s'."
+              " Have you done a full build?" % t.tagname, file=sys.stderr)
         sys.exit(1)
     else:
       while True:
@@ -174,8 +187,8 @@
 
 # by_tagnum should be complete now; we've assigned numbers to all tags.
 
-buffer = cStringIO.StringIO()
-for n, t in sorted(by_tagnum.iteritems()):
+buffer = StringIO()
+for n, t in sorted(iteritems(by_tagnum)):
   if t.description:
     buffer.write("%d %s %s\n" % (t.tagnum, t.tagname, t.description))
   else: