Marc Tompkins wrote: > I didn't mean that exactly literally - for goodness' sake, this is a > high-level, object-oriented, interpreted language! We're not writing > machine language here.
Yes, I was thinking I should re-word my email, it was worded a bit too strongly... > What I did mean, and will probably still not express as clearly as I'd > like, is that when you create a "classic" class, lots of options remain > unresolved - slots vs. dict comes to mind - and Python needs to reserve > extra space accordingly. About 134 extra bytes, it would appear. Still not sure I know what you mean. AFAIK old-style classes don't support slots, at least not user-defined slots. I do remember talk of new-style classes and properties allowing a much cleaner implementation of the class mechanisms, and it seems plausible that such generalization would lead to fewer options and streamlining of the class structure, but I don't know enough about the specifics to know if that is right. I poked around a bit in the source to see if I could figure it out but got tired of trying to sift through the header files... Kent > > On Nov 15, 2007 9:32 AM, Kent Johnson <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > Marc Tompkins wrote: > > > class B is a "new-style' class, meaning that it inherits from a base, > > pre-existing class (in this case "object", which is as basic and > generic > > as you can get!). class A has to start from nothing, which is why it > > consumes more memory yet has less functionality. > > I don't think it is really accurate to say that an old-style class > "starts from nothing". It doesn't have an explicit base class but it > does have all the old-style class machinery which is built in to Python. > > I don't know why new-style classes are smaller though. My guess is that > it is because there was an opportunity to streamline the class structure > based on experience. > > Kent > > > > > -- > www.fsrtechnologies.com <http://www.fsrtechnologies.com> _______________________________________________ Tutor maillist - Tutor@python.org http://mail.python.org/mailman/listinfo/tutor
