pip install xar==20.12.2

The XAR packaging toolchain.

Source
Among top 50% packages on PyPI.
Over 988 downloads in the last 90 days.

Version usage of xar

Proportion of downloaded versions in the last 3 months (only versions over 1%).

20.12.2

56.17%

19.4.22

27.94%

18.7.12

15.89%