PEP 841: Adding Frozen Syntax to Make Immutable Types Optimizable

[corona10]

Basic requirements (all PEP Types)

• Read and followed PEP 1 & PEP 12
• File created from the latest PEP template
• PEP has next available number, & set in filename (pep-NNNN.rst), PR title (PEP 123: <Title of PEP>) and PEP header
  • Tip: find the next available number with pepotron — run uvx pepotron next (or pipx install pepotron then pep next)
• Title clearly, accurately and concisely describes the content in 79 characters or less
• Core dev/PEP editor listed as Author or Sponsor, and formally confirmed their approval
• Author, Status (Draft), Type and Created headers filled out correctly
• PEP-Delegate, Topic, Requires and Replaces headers completed if appropriate
• Required sections included
  • Abstract (first section)
  • Copyright (last section; exact wording from template required)
• Code is well-formatted (PEP 7/PEP 8) and is in code blocks, with the right lexer names if non-Python
• PEP builds with no warnings, pre-commit checks pass and content displays as intended in the rendered HTML
• Authors/sponsor added to .github/CODEOWNERS for the PEP

Standards Track requirements

• PEP topic discussed in a suitable venue with general agreement that a PEP is appropriate
• Suggested sections included (unless not applicable)
  • Motivation
  • Specification
  • Rationale
  • Backwards Compatibility
  • Security Implications
  • How to Teach This
  • Reference Implementation
  • Rejected Ideas
  • Open Issues
  • Acknowledgements
  • Footnotes
  • Change History
• Python-Version set to valid (pre-beta) future Python version, if relevant
• Any project stated in the PEP as supporting/endorsing/benefiting from the PEP formally confirmed such
• Right before or after initial merging, PEP discussion thread created and linked to in Discussions-To and Post-History

[read-the-docs-community]

Documentation build overview

📚 pep-previews | 🛠️ Build #33943302 | 📁 Comparing 9155ab1 against latest (d2259e1)

  🔍 Preview build  

21 files changed · + 2 added · ± 19 modified

+ Added

• pep-0841/index.html
• pep-0842/index.html

± Modified

• index.html
• numerical/index.html
• pep-0000/index.html
• pep-0011/index.html
• pep-0514/index.html
• pep-0694/index.html
• pep-0719/index.html
• pep-0745/index.html
• pep-0764/index.html
• pep-0790/index.html
• and 9 more...

[corona10]

@hugovk I’d prefer to merge this PR as it stands, incorporating your suggestion, and then prepare for a second round of discussion. Would that be okay with you?

[hugovk]

Sure, merge away!

[hugovk]

Sure, merge away!

[vstinner]

Can you please consider merging this PR? You're supposed to merge the PR before starting a discussion on a PEP.

It's strange that PEP 841 is being discussed whereas https://peps.python.org/pep-0841/ doesn't exist yet!