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From: Chris Angelico <rosuav@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: What is a function parameter =[] for?
Date: Thu, 26 Nov 2015 22:24:44 +1100
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On Thu, Nov 26, 2015 at 10:12 PM, Dave Farrance <df@see.replyto.invalid> wrote:
> Marko Rauhamaa <marko@pacujo.net> wrote:
>
>>Dave Farrance <df@see.replyto.invalid>:
>>
>>> (Conversely, I see that unlike CPython, all PyPy's numbers have
>>> unchanging ids, even after exiting PyPy and restarting, so it seems
>>> that PyPy's numerical ids are "faked".)
>>
>>What's a faked id?
>
> You can figure out what I'm getting at -- i.e. I presume that the ids
> are not pointers to stored numbers in memory (as with CPython) but are a
> translation of the numerical variable's value.

As long as they're unique among concurrently-existing objects, that's
fully compliant and not at all invalid. It might be generated in some
way from its value, but that's safe as long as there's a scheme that
keeps all other objects away from them.

ChrisA