PEP 793, 803, 820: Update & mark as Final

[encukou]

• Final implementation has been merged (including tests and docs)
• PEP matches the final implementation
• Any substantial changes since the accepted version approved by the SC/PEP delegate
  • I think the changes turned out to not be substantial; see below
• Pull request title in appropriate format (PEP 123: Mark as Final)
  • I hope combining them is fine :)
• Status changed to Final (and Python-Version is correct)
• Canonical docs/spec linked with a canonical-doc directive
  (or canonical-pypa-spec for packaging PEPs,
  or canonical-typing-spec for typing PEPs)

Besides typos, minor inaccuracies, and links to current docs and implementation-tracking issues, the changes are:

PEP 793:

• Updated with changes specified in PEP 820

PEP 803:

• If Py_TARGET_ABI3T is defined, then Python.h will make sure that Py_GIL_DISABLED is defined as well.
  Users may check this macro to enable free-threading-specific code like extra locking.

  (Users do this in practice.)

• Add a PyABIInfo_FREETHREADING_AGNOSTIC flag for PyABIInfo.flags

  (I forgot to mention it both here and in Add a struct, slot & function for checking an extension's ABI capi-workgroup/decisions#72.)

• Mention that PyCriticalSection was added too.

PEP 820:

• Clarify that the PySlot_STATIC flag is required for data that needs to be static (Py_mod_methods, Py_tp_methods, Py_tp_members, Py_tp_getset) when using the new-style slots.
  (The original reference implementation didn't have this.)

[read-the-docs-community]

Documentation build overview

📚 pep-previews | 🛠️ Build #33290881 | 📁 Comparing 4cc7ea2 against latest (c7fb679)

  🔍 Preview build  

6 files changed · ± 6 modified

± Modified

• index.html
• numerical/index.html
• pep-0000/index.html
• pep-0793/index.html
• pep-0803/index.html
• pep-0820/index.html