Python Language Reference

The Python Language Reference is the official, authoritative specification of the Python programming language.

Python 3.9.0 was released in October 2020. It introduced the following new language features:

  • union operators added to dict
  • type hinting generics in standard collections
  • relaxed grammar restrictions on decorators

See What’s New In Python 3.9 for more details.

Read the Authoritative Specification

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