Python 3.15: frozendict, UTF-8 by Default, and More
Python 3.15 reaches beta with frozendict, default UTF-8 mode, sentinel values, and unpacking in comprehensions.
Blog
2026
The Python 3.14 GC Incident: Incremental GC Reverted in 3.14.5 and 3.15
Python’s new incremental garbage collector, shipped in 3.14.0–3.14.4, caused severe memory pressure and was rolled back in 3.14.5 and 3.15.
Python 3.14: Template Strings, Subinterpreters, and Deferred Annotations
Python 3.14 introduced t-strings, multiple interpreters in the stdlib, deferred annotation evaluation, and Zstandard support.