Mutable objects inside tuples - good or bad?

[Terry Reedy]

On 4/7/2014 11:26 AM, Paul Kölle wrote:

>  >>> c = (1,2,3)
>  >>> d = (1,2,3)
>  >>> c is d
> False

An implementation would be allowed to make that True, as it does for 
small ints and short strings that could be identifiers.

 >>> a = 'one'
 >>> b = 'one'
 >>> a == b; a is b
True
True

However, duplicate tuples are much rarer than duplicate identifier strings.

-- 
Terry Jan Reedy