On 5/25/21 12:37 AM, Greg Ewing wrote:
On 25/05/21 9:27 am, Cameron Simpson wrote:
On 24May2021 16:17, hw <h...@adminart.net> wrote:
>
Or it doesn't forget
about the old one and the old one becomes inaccessible (unless you
have a reference to it, if there is such a thing in python). How do
you call that?
You're conflating values
(objects, such as an int or a string) with variables (which _are_
references in Python,
I think hw might have meant the C++ notion of a reference to
a *variable*. There is no equivalent of that in Python.
yes, or a reference in perl
Python does have references to *objects*. All objects live on
the heap and are kept alive as long as there is at least one
reference to them.
If you rebind a name, and it held the last reference to an
object, there is no way to get that object back.
Are all names references? When I pass a name as a parameter to a
function, does the object the name is referring to, when altered by the
function, still appear altered after the function has returned? I
wouldn't expect that ...
On the other hand, if you shadow a name, the original name
still exists, and there is usually some way to get at it,
e.g.
>>> int = 42
>>> int
42
>>> __builtins__.int
<class 'int'>
>>>
You mean built-in objects never go away, even when they are no longer
referenced?
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