[Python-Dev] Update on PEP 523 and adding a co_extra field to code objects

[Terry Reedy]

On 8/29/2016 5:38 PM, Brett Cannon wrote:

> who objected to the new field did either for memory ("it adds another
> pointer to the struct that won't be typically used"), or for conceptual
> reasons ("the code object is immutable and you're proposing a mutable
> field"). The latter is addressed by not exposing the field in Python and

Am I correct is thinking that you will also not add the new field as an 
argument to PyCode_New?

 > clearly stating that code should never expect the field to be filled.

I interpret this as "The only code that should access the field should 
be code that put something there."

-- 
Terry Jan Reedy