Python 3.15 released with performance and language upgrades

Python 3.15 is out, bringing several upgrades including lazy imports—which speeds up startup by loading modules only when needed. There’s now a 'frozendict' built-in type, making immutable, hashable dictionaries native. The release introduces an easier way to create unique object markers with 'sentinel()', and a faster profiling tool using statistical sampling. The built-in just-in-time compiler now boosts performance by 8% to 13% in benchmarks.

• Lazy imports reduce program startup time
• Native frozendict type for immutable dictionaries
• Sentinel objects now have a built-in method
• New profiler adds low-impact performance tracking
• JIT compiler now boosts speed by up to 13%