"Phillip J. Eby" wrote:

...

try: dm = self.__dict__[_v_dm_] except KeyError: if name=='id' and val==self.__dict__['id']: return raise

Hopefully this should only perform the extra computations when the first part fails...

Are Python classes derived from DataSkin supposed to call DataSkin.__init__ ?

Anyway, perhaps this would be a small improvement:

try: dm = self.__dict__[_v_dm_] except KeyError: if (name=='id' and self.__dict__.has_key('id') and val==self.__dict__['id']): return raise

What rubbish! I didn't mean that at all! I think what I meant was this: try: dm = self.__dict__[_v_dm_] except KeyError: if name=='id': if self.__dict__.has_key('id') and val==self.__dict__.['id']: return else: self.__dict__['id']=val return raise -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net