[Python-ideas] unify usage of mutable and immutable objects
Terry Reedy
tjreedy at udel.edu
Tue Feb 28 16:49:38 EST 2017
On 2/28/2017 1:48 PM, David Mertz wrote:
> So it sounds like what you want is this:
>
> In [30]: class FrozenSet(frozenset):
> ...: def pop(self):
> ...: item = next(iter(self))
> ...: return item, self-{item}
> ...:
>
> In [31]: a = FrozenSet({1,2,3,4,5})
>
> In [32]: a.pop()
> Out[32]: (1, frozenset({2, 3, 4, 5}))
>
>
> I think I'm +1 on `frozenset` itself growing that method.
To me, 'pop' implies mutation. Tuples do not have a pop method, and it
is not obvious to me that either tuples or frozensets should. What are
the use cases that are not better served by converting to list or set?
--
Terry Jan Reedy
More information about the Python-ideas
mailing list