Python 3 compatibility

tools/pretty_gyp.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """Pretty-prints the contents of a GYP file."""
 
+from __future__ import print_function
+
 import sys
 import re
 
 
 # Regex to remove comments when we're counting braces.
 COMMENT_RE = re.compile(r'\s*#.*')
 
 # Regex to remove quoted strings when we're counting braces.
 # It takes into account quoted quotes, and makes sure that the quotes match.
 # NOTE: It does not handle quotes that span more than one line, or
@@ skipping 99 matching lines @@
   basic_offset = 2
   last_line = ""
   for line in lines:
     line = line.strip('\r\n\t ')  # Otherwise doesn't strip \r on Unix.
     if len(line) > 0:
       brace_diff = 0
       if not COMMENT_RE.match(line):
         (brace_diff, after) = count_braces(line)
       if brace_diff != 0:
         if after:
-          print " " * (basic_offset * indent) + line
+          print(" " * (basic_offset * indent) + line)
           indent += brace_diff
         else:
           indent += brace_diff
-          print " " * (basic_offset * indent) + line
+          print(" " * (basic_offset * indent) + line)
       else:
-        print " " * (basic_offset * indent) + line
+        print(" " * (basic_offset * indent) + line)
     else:
-      print ""
+      print("")
     last_line = line
 
 
 def main():
   if len(sys.argv) > 1:
     data = open(sys.argv[1]).read().splitlines()
   else:
     data = sys.stdin.read().splitlines()
   # Split up the double braces.
   lines = split_double_braces(data)
 
   # Indent and print the output.
   prettyprint_input(lines)
   return 0
 
 
 if __name__ == '__main__':
   sys.exit(main())