Subj : [$] A "frozen" dictionary for Python
To   : All
From : LWN.net
Date : Thu Dec 04 2025 14:45:07

[$] A "frozen" dictionary for Python

Date:
Thu, 04 Dec 2025 14:42:12 +0000

Description:
Dictionaries are ubiquitous in Python code; they are the data structure of
choice for a wide variety of tasks.  But dictionaries are mutable, which
makes them problematic for sharing data in concurrent code.  Python has
added various concurrency features to the language over the last decade or
so async , free threading without the global interpreter lock (GIL), and 
independent subinterpreters but users must work out their own
solution for an immutable dictionary that can be safely shared by
concurrent code.  There are existing modules that could be used, but a recent 
proposal, PEP 814 ("Add frozendict
built-in type"), looks to bring the feature to the language itself.

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Link to news story:
https://lwn.net/Articles/1047238/


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