
`jinja2` can be a costly import, and right now it happens at startup every time we run Spack. This slows down `spack --print-shell-vars` a bit, which is needed by `setup-env.*sh`.
`jinja2` can be a costly import, and right now it happens at startup every time we run Spack. This slows down `spack --print-shell-vars` a bit, which is needed by `setup-env.*sh`.