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You do know that you don't have to use the system version of python don't you? You can always install a newer version and then select which one you use for which task.

If you want the system packages on your OS to jump up to new versions as time goes by then you want to look at a Rolling Release distributions (e.g. Arch).

Alternatively you can use Debian with either Stable, Testing or Unstable as the source rather than a traditional named version (Note: research this before trying it so you understand the risks that you are taking).