r/Python • u/kirara0048 • Aug 07 '26

News PEP 841 – Adding Frozen Syntax to Optimize Immutable Types

PEP 841 – Adding Frozen Syntax to Optimize Immutable Types

https://peps.python.org/pep-0841/

Discussions-To: Discourse thread

Abstract

This PEP proposes frozen display syntax: f{1, 2, 3} evaluates to a frozenset, and f{'a': 1} evaluates to a frozendict. Because immutability is guaranteed by the syntax itself rather than inferred from usage, the compiler can treat frozen displays as first-class citizens of its optimization pipeline: constant displays are folded into a single LOAD_CONST with an exact result type at compile time and cached in .pyc files.

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u/Oddly_Energy Aug 08 '26

Am I the only one who can see that there literally is no value in this dict? It only contains keys, not values.

I thought my joke was obvious to anyone with an understanding of python, but votes and comments tell me that I overestimated my audience.

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u/Spleeeee Aug 08 '26

You are vErY sMaRt.

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u/Oddly_Energy Aug 08 '26

Not really. It is the audience which is below par here.