What’s New in Python 3.12? Key Features, Improvements, and Deprecations
Python 3.12.0, the latest major release, introduces flexible f‑string parsing, buffer protocol support, new debugging APIs, isolated sub‑interpreters, enhanced error messages, performance boosts, updated type‑annotation syntax, and removes several deprecated modules and functions.
Python 3.12.0 stable release is the latest major version of the Python programming language, bringing many new features and optimizations.
New Features
More flexible f‑string parsing, allowing many previously disallowed constructs (PEP 701).
Support for the buffer protocol in Python code (PEP 688).
New debugging/analysis API (PEP 669).
Isolated sub‑interpreters with separate global interpreter locks (PEP 684).
Improved error messages with suggestions for likely misspellings.
Support for Python function names in Linux perf reports.
Various performance improvements (e.g., PEP 709 and support for the BOLT binary optimizer), expected overall speed increase of about 5%.
Type Annotations
New syntax for generic class type annotations (PEP 695).
New method‑override decorator (PEP 698).
Deprecations and Removals
Removal of deprecated wstr and wstr_length members from the C implementation of Unicode objects (PEP 623).
Many long‑standing deprecated methods and classes removed from the unittest module.
Deprecated smtpd and distutils modules removed (see PEP 594 and PEP 632; setuptools still provides distutils).
Numerous other obsolete functions, classes, and methods have been removed.
Invalid backslash escape sequences in strings now raise a SyntaxWarning instead of a DeprecationWarning.
Internal representation of integers changed in preparation for performance enhancements (may affect Cython‑generated code).
For more details, see the official “What’s New in Python 3.12” documentation: https://docs.python.org/dev/whatsnew/3.12.html .
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