Python 3.9 is the latest version of the Python programming language, bringing a host of new features and improvements. Here's a summary of the most notable changes:

  • New Syntax for Type Hints
    Python 3.9 introduces a new syntax for type hints, making them more explicit and easier to read. For example, instead of List[int], you can now use list[int].

  • Pattern Matching
    Pattern matching is a new feature that allows you to match patterns in variables. This can make your code more readable and concise.

  • New Built-in Functions
    Python 3.9 adds several new built-in functions, such as pipe and any for set-like objects.

  • Performance Improvements
    The performance of Python 3.9 has been improved in several areas, including garbage collection and the garbage collector itself.

  • Removed Features
    Some features have been removed in Python 3.9 to clean up the language and make it more consistent. For example, the __slots__ attribute is now applied to all new-style classes by default.

For more details, check out the Python 3.9 release notes.

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  • Python 3.9 Features