Lawful != Mutable (was Can Python function return multiple data?)

[Rustom Mody]

On Sunday, June 7, 2015 at 10:04:37 PM UTC+5:30, Chris Angelico wrote:
> On Mon, Jun 8, 2015 at 2:20 AM, Rustom Mody  wrote:
> > Ok now rewrite that para above with
> > s/tuple/numbers like 3 or 666/
> > So I put '3' on the ram and grind it to finest powder.
> > Have all trinities (of religious or secular variety) disappeared?
> > 666 gone has the devil been banished from God's (or Steven's) universe?
> 
> If you write down your phone number and give it to a girl you like,
> and she burns that piece of paper, do you no longer have a phone
> number? No, but she certainly doesn't have your phone number any more.
> There's a difference between destroying a representation and
> destroying the original entity. But Steven's point wasn't about how
> easy/hard it is to destroy something; it was about a tuple's
> immutability NOT being a prevention of its destruction, and therefore
> it's not that sense of the word in which they're immutable. Similarly,
> you could destroy a document on which God's laws are written (in the
> original dictionary sense; if you don't want to believe in immutable
> laws of a Deity, you can substitute in a law of physics - for
> instance, the law that two objects with mass exert a force of
> attraction on each other due to gravity), and it wouldn't destroy the
> law itself.
> 
> ChrisA

Recent thread on python ideas
https://mail.python.org/pipermail/python-ideas/2015-June/034177.html

Since "python's immutable" ≠ "really immutable", we now need a "really immutable"