Peanut butter is the dependable one. It shows up in the pantry, it does not need to be refrigerated, and it will hold a sandwich together on a long hike. Python is peanut butter: batteries included, readable, and quietly everywhere — from data science notebooks to the glue scripts that keep a server farm alive.

Jelly is the flashy one. It is bright, it is sweet, and on its own it is a little too much. JavaScript is jelly: it runs in the one runtime nobody can avoid — the browser — and it turns a dry piece of toast into something you actually want to eat.

Neither one is a complete lunch. A jar of peanut butter with no jelly is a sad, sticky mouthful. A spoonful of jelly with no peanut butter is a sugar rush followed by regret.

The sandwich is the stack

The reason the PB&J works is that the two spreads are complementary. The peanut butter gives structure and protein; the jelly gives sweetness and acid. In software terms, Python is where the durable logic lives and JavaScript is where the user actually touches it.

Most real projects end up doing exactly this. A Python service behind an HTTP API, and a JavaScript front end that renders it. The two of them are not rivals — they are two halves of the same sandwich.

Keeping the sandwich in one place

The important part is that all of the ingredients for this post — the Markdown and the images — live together in a single directory:

content/
└── blog/
    └── peanut-butter-and-jelly/
        ├── index.md
        └── images/
            ├── peanut-butter.svg
            ├── jelly.svg
            └── pbj.svg

The {attach} links are what make this work. When Pelican builds the article, each {attach}images/... reference is rewritten and the linked file is copied into the article's output directory, preserving the images/ relationship. The post is a self-contained bundle: move the folder, and everything it needs comes with it.

So the next time someone tries to start a language war, point out that nobody argues about whether a PB&J should have peanut butter or jelly. You put them together, and you get lunch.