On Sat, 14 Jan 2006 23:26:40 -0500, Mike Meyer wrote: > Steven D'Aprano <[EMAIL PROTECTED]> writes: >> On Sat, 14 Jan 2006 18:26:41 -0500, Mike Meyer wrote: >>> If two objects ARE the same value, then they should be the same >>> object. >> You are assuming that values are unique, and that therefore is X "is" (in >> the English sense, not the Python sense) some value, then no other thing Y >> can also be the same value. > > I would say that's a valid definition of value.
Perhaps it is, in some contexts. But I dispute that it is true in all contexts. It depends on whether you CHOOSE to demand that values are unique or not. >>> x = 2000 >>> y = 1000 + 1000 >>> x is y False >>> x == y True This causes me no trouble at all. Two instances of the same value, no big deal. >> I have no problem with that. Some objects are mutable and can change >> their value > > If the object *is* the value, how can it change to be a different value > without also changing to be a diffent object? Because that's what they do. Think of it this way: objects are the memory location, the value is the particular pattern of bits at that memory location. Just because you flip a couple of bits at location N, changing the value, the location doesn't change. -- Steven. -- http://mail.python.org/mailman/listinfo/python-list
