dput-ng is a from-scratch refresh of the old dput(1) command. This tool is used (at some point) to aid with the act of uploading a package to an archive.

dput-ng aims to be compatible with the old dput(1) config files, while adding additional features for better sanity checking, and designed in an extensible way.

In addition, dput-ng also provides a Python package that's totally usable from 3ed party apps that wish to integrate with dput-ng.

Check the docs for more on topics that might interest you.