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About the implementation of del in Python 3

On Fri, Jul 7, 2017 at 10:34 AM, Gregory Ewing
<greg.ewing at canterbury.ac.nz> wrote:
> Steve D'Aprano wrote:
>> Address refers to a position in space.
> Not always. A PO Box number can remain the same when its owner's
> location in space changes. And IP addresses notoriously fail to
> identify physical locations.

A position in some form of space. An IP address gives a position
within the internet; you can tease it apart to figure out which RIR,
which country, which ISP, and which computer. A street address gives a
position on the planet; you can tease it apart to find which country,
which city, which street, and which mailbox. A PO Box is actually the
same thing as a street address, but instead of telling you where its
owner can be found, it tells you where *the box* can be found. A
memory address tells you where some byte/word can be found in some
memory space - maybe the process's virtual memory, maybe the OS's
virtual memory, maybe the computer's physical memory. A web address
tells you where a document can be found in the cobwebs of the
internet. Not all of them are directly connected to physical
locations, but all of them can be used to locate something.