*To Be Written...* The goal of this section is to provide a practical, step-by-step guide to getting Python packages installed, presuming **any** already-working Python installation. At this stage, the **greatest danger is "easy just-works """solutions"""**. In this ecosystem, they tend to be *ridden* with little gotchas, OS-dependent behavior, and confusing ways of misconfiguring them. Thus, a deliberate decision is taken to presume *very basic* terminal knowledge (as provided by the dedicated section of this very book), and barebones working system Python installation, and explain packaging in the only reliably built-in and future-proof way: `venv` and `pip`. Special care is especially paid to `requirements.txt`, which at this stage is the only comprehensible way of "saving" what packages (and at what versions!) are installed in a `.venv` for ex. use by others. As with the rest of the book, it should be written in an accessible style.