p3.diff

diff --git a/clang-format-diff.py b/clang-format-diff.py
index ffa30e7..9c5bcc5 100755
--- a/clang-format-diff.py
+++ b/clang-format-diff.py
@@ -27,7 +27,7 @@ import difflib
 import re
 import string
 import subprocess
-import StringIO
+import io
 import sys
 
 
@@ -89,9 +89,9 @@ def main():
           ['-lines', str(start_line) + ':' + str(end_line)])
 
   # Reformat files containing changes in place.
-  for filename, lines in lines_by_file.iteritems():
+  for filename, lines in lines_by_file.items():
     if args.i and args.verbose:
-      print 'Formatting', filename
+      print('Formatting', filename)
     command = [args.binary, filename]
     if args.i:
       command.append('-i')
@@ -109,7 +109,7 @@ def main():
     if not args.i:
       with open(filename) as f:
         code = f.readlines()
-      formatted_code = StringIO.StringIO(stdout).readlines()
+      formatted_code = io.StringIO.StringIO(stdout).readlines()
       diff = difflib.unified_diff(code, formatted_code,
                                   filename, filename,
                                   '(before formatting)', '(after formatting)')