On Thursday, November 19, 2015 at 7:28:44 PM UTC-5, Steven D'Aprano wrote: > On Fri, 20 Nov 2015 05:50 am, BartC wrote: > > > > I said that Python's "=" does a very shallow copy. And I stated that in > > A=B, something of B must be copied into A. > > > > I (and probably others) would like to know why none of that is correct. > > But I suspect I'm not wrong. > > Nothing of B is copied.
I think we are stuck in a simple terminology conflict here. There is something of B copied. The name B refers to a value. In CPython, that reference is a pointer. That pointer (the memory address) is copied from B to A. Nothing of "B's value", that is, the object B is referring to, is copied. But there is something about B (the pointer to its value) that is now also something about A, because A also has that pointer. --Ned. -- https://mail.python.org/mailman/listinfo/python-list
