tl;dr

• cooldown

Give security researchers time to detect supply chain attacks, by delaying installing a package's latest release by n days. Where n is delay before security researchers are able to acknowledge sarcasm (aka some arbitrary number).

$> pip install --uploaded-prior-to=P3D pip --force-reinstall # exclude the recent pip release

Where 3D is delay by 3 days. From the context, guess P means prior, not pussy, pizza, nor pedocrat. Actually your guess is as good as mine. I'm confused what P is supposed to mean, especially given the state of the dating scene.

• lock file support

some foreplay and teasing