def check_sfffile():
 if (not which('sfffile')):
  raise ApplicationNotFoundError((_MISSING_APP_MESSAGE % 'sfffile'))

def check_sfffile ( ) : if ( not which ( 'sfffile' ) ) : raise ApplicationNotFoundError ( ( _MISSING_APP_MESSAGE % 'sfffile' ) )
raise error if sfffile is not in $path .