def get_extension_manager():
 global _extension_manager
 if (not _extension_manager):
  _extension_manager = ExtensionManager(u'reviewboard.extensions')
 return _extension_manager

def get_extension_manager ( ) : global _extension_manager if ( not _extension_manager ) : _extension_manager = ExtensionManager ( u'reviewboard.extensions' ) return _extension_manager
return the extension manager used by review board .