Welcome aboard. If you’ve googled “Python tutorial” you’ve seen this garbage:

for foo in bar:
    print(baz[foo])

That’s not teaching. That’s a curse from the 1970s.
Foo, bar, and baz aren’t variables: they’re diseased rats that infest new crew members bunks.

Why it’s poison

  • Foo/bar/baz tell you nothing.
  • You don’t know what the loop does.
  • You don’t know what the data is.
  • But hey, the tutorial writer saved three keystrokes.

Future You at 2 AM will see this and start googling “how much do goat herders make per year?”

How sane pirates write code

for poster in posters:
    context.log.info(
        "Poster processed",
        extra={"name": poster["name"], "bounty": poster["bounty"]}
    )

Now it reads like English: “For each poster in posters, print the name and bounty.”
Even Zoro can follow this without getting lost.

Pirate Rule #0: Don’t be generic

👉 Foo/bar/baz walk the plank.
👉 Single-letter variables are banned unless you’re literally looping the alphabet.
👉 Name your variables so even Roronoa Zoro can follow the map.

Exercise: Wanted!

Fix this crime:

for d in y:
    for o in d["z"]:
        print(o["g"])

Rewrite it with names that make sense. (Hint: posters → poster → items → menu_id)

Welcome to Day 1. Many tutorials start with nonsense like:

for foo in bar:
    print(baz[foo])

It runs. But it doesn’t teach.

Why it’s unhelpful

  • Doesn’t describe the data.
  • Doesn’t describe the operation.
  • Creates technical debt before you’ve even learned the language.

How professionals write code

for poster in posters:
    context.log.info(
        "Poster processed",
        extra={"name": poster["name"], "bounty": poster["bounty"]}
    )

Readable, structured, and logs in a way Future You can actually filter.

Engineering Rule: Don’t be generic

👉 Ban foo/bar/baz.
👉 Don’t use single-letter variables (except trivial math).
👉 Variables should tell the story of the data they hold.

Exercise: Rewrite the Loop

Given:

for d in y:
    for o in d["z"]:
        print(o["g"])

Refactor it with:

  • posters → poster → items → menu_id
  • Replace print() with context.log.info and structured extra.