Why there are no 'physical' object variables (only references)?

[Tydr Schnubbis]

Steve Horne wrote:
> The trouble is, this is all subjective. The Python one-size-fits-all
> everythings-an-object-with-a-reference approach will probably always
> bug me, but a lot depends on what you're used to.
> 

Not sure I follow.  Python uses value semantics for numbers and strings. 
  The reason you get them for strings is that strings are immutable, so 
Python always creates a copy when a string is about to be changed.

So it works like in D, except for the strings.