def _save_modified_value(_config_vars, cv, newvalue):
 oldvalue = _config_vars.get(cv, '')
 if ((oldvalue != newvalue) and ((_INITPRE + cv) not in _config_vars)):
  _config_vars[(_INITPRE + cv)] = oldvalue
 _config_vars[cv] = newvalue

def _save_modified_value ( _config_vars , cv , newvalue ) : oldvalue = _config_vars . get ( cv , '' ) if ( ( oldvalue != newvalue ) and ( ( _INITPRE + cv ) not in _config_vars ) ) : _config_vars [ ( _INITPRE + cv ) ] = oldvalue _config_vars [ cv ] = newvalue
save modified and original unmodified value of configuration var .