PEP 626: outdated timeline for `co_lnotab` deprecation/removal

[HongchengFan]

Documentation

PEP 626 (https://peps.python.org/pep-0626/) currently states that:

"The co_lnotab attribute will be deprecated in 3.10 and removed in 3.12."

However, the current documentation and runtime behavior no longer match this timeline:

• The Data Model documentation says that co_lnotab is deprecated since 3.12 and may be removed in 3.15:
  https://docs.python.org/3/reference/datamodel.html#code-objects

• In practice, Python 3.12–3.14 still expose co_lnotab and emit:
  DeprecationWarning: co_lnotab is deprecated, use co_lines instead
  while Python 3.10–3.11 do not emit this warning.

This suggests that the PEP reflects the original plan, but not the current behavior.

It would be helpful to update PEP 626 to reflect the current status, or add a note clarifying that the deprecation/removal schedule has changed. This may be intentional, but it would be helpful to clarify.

[sergey-miryanov]

PEP has a final status, and it serves historical reasons now. We usually don't update PEPs in the final state.

[HongchengFan]

Thanks for the clarification!

That makes sense regarding PEPs being kept as historical records.

[hugovk]

Let's mark this as a duplicate of #134690 and continue discussion there.