inheritance

[Duncan Booth]

"Duncan Smith" <buzzard at urubu.freeserve.co.uk> wrote in
news:bca77e$aq2$1 at newsg3.svr.pol.co.uk: 

> Is there any alternative to explicitly overloading each of the parent
> class functions that return a new instance?

You could try creating an object of the appropriate type directly from 
inside table.NumTable.__mul__

Something like:

def __mul__(self, other):
   values, variables = ... calculate them ...

   if issubclass(self, other):
      resType = self.__class__
   else:
      resType = other.__class__

   return resType(values, variables)

I don't know what you would do though if self and other are both subclasses 
on NumTable but neither is a subclass of the other. To be correct you'ld 
probably need to find the common base class.

-- 
Duncan Booth                                             duncan at rcp.co.uk
int month(char *p){return(124864/((p[0]+p[1]-p[2]&0x1f)+1)%12)["\5\x8\3"
"\6\7\xb\1\x9\xa\2\0\4"];} // Who said my code was obscure?