#NEWLINE# @ classmethod #NEWLINE# def apply_parser_contraints( cls , parser , options ) : #NEWLINE# #INDENT# cachebusters = ( options . css_cachebuster , options . css_cachebuster_filename , options . css_cachebuster_only_sprites ) #NEWLINE# if ( sum ( cachebusters ) > 1 ) : #NEWLINE# #INDENT# parser . error ( "You can't use --cachebuster, --cachebuster-filename or --cachebuster-filename-only-sprites at the same time." )