Coming soon to Python 3.15: frozendict
The Steering Council has just accepted @vstinner and @dongheena's PEP 814 "Add frozendict built-in type".
https://discuss.python.org/t/pep-814-add-frozendict-built-in-type/104854/121

PEP 814: Add frozendict built-in type
After careful deliberation, the Python Steering Council is pleased to accept PEP 814 â Add frozendict built-in type. The absence of an immutable dict counterpart has been a long-standing gap in Python and has been requested for a long time in different forms. We agree this is a clear net positive for the language. We are accepting this PEP with the following modifications: Performance should not be framed as a goal or motivation. The value of frozendict is in its immutability semantics, not i...
