I have been developing in Node for a few months now for non-Python projects (legacy project) and I found a NPM feature which could be helpful to developers of Python libraries.

When you install a NPM package, some show a message from the author after installation (see example below). 

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Thank you for using core-js ( https://github.com/zloirock/core-js ) for polyfilling JavaScript standard library!

The project needs your help! Please consider supporting of core-js on Open Collective or Patreon: 

> https://opencollective.com/core-js 

> https://www.patreon.com/zloirock 

Also, the author of core-js ( https://github.com/zloirock ) is looking for a good job -)

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Is it possible to adopt this? My proposal is to add an entry in the package metadata which I believe is safer and easier to implement compared to running a post-installation script. It is up for developers of package managers (pip, poetry, etc.) to actually print these on the terminal.

I appreciate comments and feedback.

Regards,

Ronie