Python 3.15.0 beta 2 has been released, the second of four planned beta releases before the final version. Key features in Python 3.15 include explicit lazy imports (PEP 810) for faster startup, a new frozendict built-in type, a sentinel built-in type, a dedicated profiling package with a high-frequency statistical sampling profiler (Tachyon), frame pointers enabled by default, unpacking in comprehensions, UTF-8 as the default encoding, and several type system improvements (TypedDict with typed extra items, TypeForm, disjoint bases). The JIT compiler has been significantly upgraded with 8-9% performance improvement on x86-64 Linux and 12-13% speedup on AArch64 macOS. The release is not recommended for production; the next beta (3.15.0b3) is scheduled for 2026-06-23.
