130 lines
6.6 KiB
Markdown
130 lines
6.6 KiB
Markdown
# Amateurfunk — BNetzA Question Catalog → Anki Decks
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A small two-stage Python pipeline that downloads the German amateur-radio
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exam question catalog ("Fragenkatalog") published by the Bundesnetzagentur
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(BNetzA) and turns it into Anki decks.
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The full source-discovery notes, JSON schema, exam-structure details, and
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per-stage design decisions live in `DESIGN.md`. This file is a short
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orientation for anyone (human or agent) opening the project.
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## What the catalog is
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- Official German amateur-radio exam questions for classes **N, E, A**
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(German license tiers).
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- Published by the Bundesnetzagentur under the **DL-DE→BY-2.0** open
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data license (free reuse, attribution required).
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- Distributed as a single ZIP containing one JSON file with the full
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question tree, plus a `svgs/` folder with figures referenced by
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individual questions.
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- Current edition at time of writing: **3. Auflage, März 2024**
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(issued 2024-03-20, valid from 2024-06-24, ~1750 questions).
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## Canonical source
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- ZIP (machine-readable): `https://www.bundesnetzagentur.de/SharedDocs/Downloads/DE/Sachgebiete/Telekommunikation/Unternehmen_Institutionen/Frequenzen/Amateurfunk/Fragenkatalog/PruefungsfragenZIP.zip?__blob=publicationFile`
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- Landing page (short link): `https://www.bnetza.de/amateurfunk-fragenkatalog`
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- PDF (human-readable, not used by this pipeline): same path with
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`Pruefungsfragen.pdf` instead of `PruefungsfragenZIP.zip`.
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The ZIP URL is stable across editions — BNetzA replaces the file
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in-place. The `Last-Modified` HTTP header is reliable for change
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detection. The filename inside the ZIP (`fragenkatalog3b.json`) encodes
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the edition (`3b` = 3rd edition, revision b) and will change on new
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editions, so we discover it from the archive rather than hard-coding.
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## Pipeline overview
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```
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BNetzA ZIP ──[Stage 1: amateurfunk_fetch.py]──► data/<slug>/
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├── fragenkatalog*.json
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├── svgs/
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├── README.txt
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└── manifest.json
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data/ ──[Stage 2: amateurfunk_anki.py]──► anki/
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├── amateurfunk-technische-kenntnisse-n.apkg
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├── amateurfunk-technische-kenntnisse-e.apkg
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├── amateurfunk-technische-kenntnisse-a.apkg
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├── amateurfunk-betriebliche-kenntnisse.apkg
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└── amateurfunk-kenntnisse-von-vorschriften.apkg
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```
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### Stage 1 — `amateurfunk_fetch.py`
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1. Download the ZIP from the canonical URL.
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2. Verify it is a valid ZIP and contains the expected JSON + SVG files.
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3. Extract to a target directory (default: `./data/<edition>/`).
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4. Emit a small `manifest.json` next to the data: source URL,
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fetched-at timestamp, `Last-Modified` from the server, JSON edition
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metadata, sha256 of the ZIP.
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5. Be idempotent — re-running without an upstream change is a no-op.
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The skip key is the HTTP `Last-Modified` header recorded on the
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previous manifest; the ZIP is deleted by default after extraction,
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so the recorded sha256 is provenance, not a re-verification target.
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See `DESIGN.md` §4 for the full idempotency contract.
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### Stage 2 — `amateurfunk_anki.py`
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1. Read the latest edition from `data/` (following
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`manifest-latest.json` to a per-edition directory).
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2. Split the catalog into five categories. Betriebliche and
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Vorschriften get one deck each (shared across every candidate).
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Technische is additionally fanned out per license class into three
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decks (N / E / A) using a strict equality split on the question's
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`class` field. The `klasse-N|E|A` tag is still emitted on every
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note for inside-Anki filtering.
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3. Render every question as an Anki note: shuffled A/B/C/D choices on
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the front, the displayed position of the correct answer on the
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back. Inline `$...$` LaTeX is converted to MathJax `\(...\)`
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delimiters; the catalog's safe inline markup (`<u>...</u>`) is
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preserved. If the question's number has an entry in
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`explanations.json` (see EXPLANATIONS.md), an English explanation
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block is appended to the back; a "low confidence" badge shows for
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entries with `confidence < 7`.
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4. Hand-roll the v11 Anki collection (SQLite + JSON config) and
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package it as a `.apkg` ZIP with deterministic timestamps. By
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default each build mints a fresh shuffle seed, so answers are
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reshuffled every run. Pass `--seed` (and `--epoch`) for the
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reproducible-build contract: same catalog + same seed + same
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timestamp → byte-identical output across runs.
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The Anki design decisions (shuffle seeding, deterministic build epoch,
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SVG dark-mode handling, schema choices) live in `DESIGN.md` §7.
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## Repo conventions
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- Python 3.11+, standard library only. No third-party dependencies
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in either stage.
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- Single-file scripts: `amateurfunk_fetch.py`, `amateurfunk_anki.py`.
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No frameworks, no CLI library beyond `argparse`.
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- Style: section banners, commented constants, docstrings on every
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function, inline comments at decision points. The two scripts
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intentionally read the same way.
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- Outputs are build artifacts: kept under `data/` and `anki/`, both
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gitignored.
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- License attribution string (required by DL-DE→BY-2.0) is preserved
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verbatim from the upstream `README.txt` whenever we redistribute the
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data.
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## Working on this repo
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- `EXPLANATIONS.md` — the editorial contract for agents asked to add
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or improve per-question explanations. The schema, the workflows
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("explain everything unexplained", "improve everything below
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confidence 7"), and the source/confidence guidance live there.
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`explanations.json` is an empty `{}` until agents populate it.
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- Start from `DESIGN.md` — it has the JSON schema, the question/answer
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conventions (answer A is always correct upstream → consumers shuffle
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before display), the LaTeX-in-questions caveat, the exam-structure
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rationale for the Anki package layout (Betriebliche, Vorschriften,
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and Technische split per license class), and per-stage design notes.
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- Do not invent new download URLs; the ones in `DESIGN.md` were
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verified against the live BNetzA site.
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- When BNetzA publishes a new edition, expect a new
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`fragenkatalog<N><rev>.json` filename inside the ZIP. The fetcher
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must not hard-code the current name.
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- Both stages have a fixture-driven test suite. Run with
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`python3 -m unittest test_amateurfunk_fetch test_amateurfunk_anki`.
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Network access is only needed for the manual smoke test of Stage 1.
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