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[Python-Dev] Expected stability of PyCode_New() and types.CodeType() signatures

> I propose to make co_argcount meaning the number of positional
> parameters (i.e. positional-only + positional-or-keyword). This would
> remove the need of changing the code that uses co_argcount.

I like the proposal, it will certainly make handling normal cases
downstream much easier because
if you do not care about positional-only arguments you can keep
inspecting co_argcount
and that
will give you what you expect. Note that if we choose to do this, it has to
be done now-ish IMHO to
avoid making the change painful because it will change the semantics of

> As for the code object constructor, I propose to make posonlyargcount an
> optional parameter (default 0) added after existing parameters.
> PyCode_New() can be kept unchanged, but we can add new PyCode_New2() or
> PyCode_NewEx() with different signature.

I am not convinced about having a default argument in the code constructor.
The code constructor
is kept with all arguments positional for efficiency and adding defaults
will make it slower or having
a more confusing an asymmetrical interface. Also, this will be misaligned
on how keyword-only
parameters are provided. This is by far not the first time this constructor
has changed.

On the Python side, the new code.replace should cover most of the
Python-side use cases regarding
creating code objects from the Python side.
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