[Python-ideas] Wild idea about mutability

[Sven R. Kunze]

On 06.06.2016 15:34, Random832 wrote:
> (a tuple containing a reference to a list
> is not hashable*, does this mean tuples are not immutable?)

Your question in brackets is actually the most important question here.

I would say it depends on who one defines it but I don't see a 
contradiction to have both variants of tuples in the same languages. 
Whatever fits your needs more in a certain situation.

>> Moreover, immutable object
>> would not be allowed to query data from global/external variables as
>> those can change and would change the observable state of the object
>> without the object noticing.
> How are you gonna stop them?

With a hammer? I don't know how you want me to answer that. It's an 
implementation detail to me as other languages can handle it properly. 
There is a way of stopping them by preventing all ways of manipulating 
state variables of an object. What those ways are is more a topic for 
long-served devs of CPython 4 or 5 ;-)


Sven