Support for Python 3.9

[dycw]

Hi @srstevenson ,

I was wondering why support for older versions of Python were dropped in this last major release?

[srstevenson]

This is to support assignment expressions, generic syntax for the built-in collections, and writing union types as Foo | Bar instead of Union[Foo, Bar] (the latter is what requires 3.10 specifically). As this package was renamed from xdg to xdg-base-dirs, you won't unintentionally pick up any backward incompatible changes even if you have no upper version bound on xdg. If you still need Python 3.9 support, you can continue to use the xdg package rather than xdg-base-dirs with no loss of features--the final 6.0.0 release of xdg supports down to Python 3.7.

[dycw]

Understood, thanks! Was just curious more than anything.

[stdedos]

Hello there! What is the suggestion for:

1. A package supporting < 3.9, and
2. It is a pip package (i.e., cannot depend on

   $ apt-cache policy python3-xdg 
    python3-xdg:
      Installed: 0.26-1ubuntu1
      Candidate: 0.26-1ubuntu1
      Version table:
     *** 0.26-1ubuntu1 500

?

[srstevenson]

@stdedos The last release of the xdg package on PyPI (6.0.0) supports Python >=3.7.