Build requires missing python 3.7

I am attempting to run the from the patchbox-os-gen repository. However, it fails because pi-sound requries python 3.7 but python 3.7 is not found in the Debian stretch ARM repository.

I could not find a repository with the ARM version.

Is it available somewhere? If not how do I execute the build?

Use branch patchbox-2020-03. I’ve just updated default branch on the repository to be it.

Thank you that seems to have solved the problem.