def get_filter_by_name(filtername, **options):
 cls = find_filter_class(filtername)
 if cls:
  return cls(**options)
 else:
  raise ClassNotFound(('filter %r not found' % filtername))

def get_filter_by_name ( filtername , ** options ) : cls = find_filter_class ( filtername ) if cls : return cls ( ** options ) else : raise ClassNotFound ( ( 'filter %r not found' % filtername ) )
return an instantiated filter .