Python 3.15 beta 1 just dropped! 🐍 Feature freeze is here, which means all the major features are locked in. Highlights: • Lazy imports with the `lazy` keyword • `frozendict` and `sentinel` built-in types • JIT compiler now 8-9% faster on x86-64 Linux • Unpacking in comprehensions • High-frequency statistical profiler • Frame pointers enabled by default If you maintain Python packages, now's the time to test with 3.15 and report any issues. Final release scheduled for October 1st.

@driscollis The new built-in sentinel looks interesting Do you think there are still cases where: MISSING = object() is preferable to using sentinel?