Make generate-operator-out.py compatible with Python 3.x

Adapt generate-operator-out.py to work with both Python 2.x (x >= 6)
and 3.x

Change-Id: I20f1b212069f368f3cf289dfd6b2aaee393cac68
Signed-off-by: Bernhard Rosenkränzer <Bernhard.Rosenkranzer@linaro.org>
diff --git a/tools/generate-operator-out.py b/tools/generate-operator-out.py
index 6baa6e3..f666ad1 100755
--- a/tools/generate-operator-out.py
+++ b/tools/generate-operator-out.py
@@ -163,35 +163,35 @@
     header_files.append(header_file)
     ProcessFile(header_file)
 
-  print '#include <iostream>'
-  print
+  print('#include <iostream>')
+  print('')
 
   for header_file in header_files:
     header_file = header_file.replace(local_path + '/', '')
-    print '#include "%s"' % header_file
+    print('#include "%s"' % header_file)
 
-  print
+  print('')
 
   for enum_name in _ENUMS:
-    print '// This was automatically generated by %s --- do not edit!' % sys.argv[0]
+    print('// This was automatically generated by %s --- do not edit!' % sys.argv[0])
 
     namespaces = _NAMESPACES[enum_name].split('::')
     for namespace in namespaces:
-      print 'namespace %s {' % namespace
+      print('namespace %s {' % namespace)
 
-    print 'std::ostream& operator<<(std::ostream& os, const %s& rhs) {' % enum_name
-    print '  switch (rhs) {'
+    print('std::ostream& operator<<(std::ostream& os, const %s& rhs) {' % enum_name)
+    print('  switch (rhs) {')
     for (enum_value, enum_text) in _ENUMS[enum_name]:
-      print '    case %s: os << "%s"; break;' % (enum_value, enum_text)
+      print('    case %s: os << "%s"; break;' % (enum_value, enum_text))
     if not _ENUM_CLASSES[enum_name]:
-      print '    default: os << "%s[" << static_cast<int>(rhs) << "]"; break;' % enum_name
-    print '  }'
-    print '  return os;'
-    print '}'
+      print('    default: os << "%s[" << static_cast<int>(rhs) << "]"; break;' % enum_name)
+    print('  }')
+    print('  return os;')
+    print('}')
 
     for namespace in reversed(namespaces):
-      print '}  // namespace %s' % namespace
-    print
+      print('}  // namespace %s' % namespace)
+    print('')
 
   sys.exit(0)