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Get started with Python’s new frozendict type

Python 3.15 introduces an immutable or ‘frozen’ dictionary that is useful in places ordinary dicts can’t be used.
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C/C++

A modern, C++-native, test framework for unit-tests, TDD and BDD - using C++14, C++17 and later (C++11 support is in v2.x branch, and C++03 on the Catch1.x branch) ...