Extract files from a .tar.zstd:

python -m jaraco.zstd --extract filename.tar.zstd

Usage:

python -m jaraco.zstd --help
usage: zstd.py [-h] -e SOURCE [--out-dir OUT_DIR]

options:
  -h, --help            show this help message and exit
  -e SOURCE, --extract SOURCE
  --out-dir OUT_DIR

This project can be retired if indygreg/python-zstandard#186 is fixed.