On 28/11/2010 21:23, Greg Ewing wrote:
Rob Cliffe wrote:
But couldn't they be presented to the Python programmer as a single
type, with the implementation details hidden "under the hood"?
Not in CPython, because tuple items are kept in the same block
of memory as the object header. Because CPython can't move
objects, this means that the size of the tuple must be known
when the object is created.
But when a frozen list a.k.a. tuple would be created - either directly,
or by setting a list's mutable flag to False which would really turn it
into a tuple - the size *would* be known. And since the object would
now be immutable, there would be no requirement for its size to change.
(My idea doesn't require additional functionality, just a different API.)
Rob Cliffe
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