def zeroize_after_level(self, base_level):
        """ Set all levels after ``base_level`` to zero. """
        index = _LEVELS.index(base_level) + 1
        for level in _LEVELS[index:]:
            self.version_info[level] = 0
def zeroize_after_level ( self , base_level ) : index = _LEVELS . index ( base_level ) + 1 for level in _LEVELS [ index : ] : self . version_info [ level ] = 0
Set all levels after ``base_level`` to zero.