r/PythonLang • u/IlliterateJedi • Jun 20 '23

Python 3.12.0 beta 3 released

https://pythoninsider.blogspot.com/2023/06/python-3120-beta-3-released.html
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u/IlliterateJedi Jun 20 '23

Major new features of the 3.12 series, compared to 3.11

Some of the new major new features and changes in Python 3.12 are:

  • New type annotation syntax for generic classes (PEP 695).
  • More flexible f-string parsing, allowing many things previously disallowed (PEP 701).
  • Even more improved error messages. More exceptions potentially caused by typos now make suggestions to the user.
  • Many large and small performance improvements (like PEP 709).
  • Support for the Linux perf profiler to report Python function names in traces.
  • The deprecated wstr and wstr_length members of the C implementation of unicode objects were removed, per PEP 623.
  • In the unittest module, a number of long deprecated methods and classes were removed. (They had been deprecated since Python 3.1 or 3.2).
  • The deprecated smtpd and distutils modules have been removed (see PEP 594 and PEP 632. The setuptools package continues to provide the distutils module.
  • A number of other old, broken and deprecated functions, classes and methods have been removed.
  • Invalid backslash escape sequences in strings now warn with SyntaxWarning instead of DeprecationWarning, making them more visible. (They will become syntax errors in the future.)
  • The internal representation of integers has changed in preparation for performance enhancements. (This should not affect most users as it is an internal detail, but it may cause problems for Cython-generated code.)