bankstract 0.7.0

Convert Nigerian bank PDF statements into structured CSV.

bankstract

Convert Nigerian bank PDF statements into structured CSV. Plugin architecture — one parser per bank.

pip install bankstract

bankstract palmpay statement.pdf -o out.csv
bankstract auto unknown.pdf -o out.csv
bankstract list

Status

Bank	Status
PalmPay	v0.7 — alpha
First Bank	v0.7 — alpha
Zenith	v0.7 — alpha

Install

pip install bankstract

Optional extras:

pip install "bankstract[ocr]"      # pytesseract for scanned PDFs
pip install "bankstract[camelot]"  # camelot lattice fallback

Develop

Project uses uv for dependency + venv management.

uv sync --all-extras       # create .venv, install deps + extras from uv.lock
uv run pre-commit install  # one-time: enable the pre-commit hook
uv run pytest              # run tests
uv run ruff check src tests
uv run pyright src tests   # strict type check (see CLAUDE.md directive 8)
uv run bankstract list     # invoke CLI

Add a dependency with uv add <pkg> (dev: uv add --dev <pkg>). Commit uv.lock.

The pre-commit hook runs ruff check, ruff format --check, pyright (strict), and pytest before every commit. Bypass only in genuine emergencies with git commit --no-verify; the same checks run again in CI.

Releasing

CI publishes to PyPI automatically on push to main via .github/workflows/publish.yml. The workflow runs the full gate (ruff + pyright + pytest), and if the current pyproject.toml version already exists on PyPI it auto-bumps the minor component and commits the bump before publishing. PyPI auth uses OIDC trusted publishing — no token in repo or CI secrets.

To prepare a release locally:

scripts/bump-version.sh                 # patch bump
scripts/bump-version.sh minor           # 0.2.x -> 0.3.0
scripts/bump-version.sh major           # 0.x.x -> 1.0.0
scripts/bump-version.sh 0.3.0           # exact set
uv build                                # dist/*.whl + dist/*.tar.gz
uv publish dist/*                       # only if not using the GH workflow; needs --token or UV_PUBLISH_TOKEN

Trusted-publisher setup (one-time, owner only): create a publisher at https://pypi.org/manage/account/publishing/ with workflow publish.yml, repo logickoder/bankstract.

Usage

bankstract <bank> <pdf> -o <out>               # explicit parser
bankstract auto <pdf> -o <out>                 # auto-detect via Parser.detect_confidence()
bankstract list                                # show registered parsers
bankstract <bank> <pdf> -o out.json -f json    # JSON instead of CSV
cat statement.pdf | bankstract auto - -o -     # stdin / stdout pipeline

Pass - as the PDF arg to read from stdin, or - to -o to write to stdout. When stdout is the data sink, informational messages go to stderr so the data stream stays clean.

Unparseable blocks are written to a .log sidecar next to the output file.

Python API

import bankstract

bankstract.list_parsers()           # ['fbn', 'palmpay', 'zenith']
bankstract.detect("statement.pdf")  # 'palmpay' | None

result = bankstract.parse("statement.pdf")            # auto-detect
result = bankstract.parse(fp, bank="fbn")             # explicit; fp is BytesIO

result.metadata.account_holder
result.metadata.statement_period_start
result.transactions[0].balance
result.format_version

Public surface (semver-locked)

Only the names re-exported from bankstract are part of the semver contract:

Name	Kind	Purpose
parse	function	parse(source, *, bank=None) -> ParseResult
detect	function	detect(source) -> str | None (max-score bank)
list_parsers	function	sorted bank names
Parser	ABC	base class for new parsers
Transaction	pydantic	row schema
StatementMetadata	dataclass	account holder / period / opening + closing balance
ParseResult	dataclass	transactions[], totals, format_version, metadata
ParseError	exception	layout mismatch
ReconciliationError	exception	invariant break
__version__	str	package version

source accepts pathlib.Path, a string path (treated as a path), or a seekable binary stream (e.g. io.BytesIO). Auto-detection picks the parser with the highest detect_confidence score — ties resolve to registration order. Anything imported from a submodule prefixed with _ (bankstract._api, bankstract._pdfplumber, bankstract._layout) is internal and may change in any release.

Reconciliation invariant

Two complementary checks; the CLI picks whichever applies per bank.

• Row-wise (banks that print a running balance): prev.balance ± debit/credit == curr.balance. Mismatch raises ReconciliationError with the row index.
• Totals-based (banks like PalmPay that omit a balance column): the parser reads Total Money In / Total Money Out from the statement header and the CLI asserts that the sum of parsed credits/debits equals those totals.

Both modes exist to catch silently-dropped rows — the failure mode of naive PDF parsers.

Contributing a bank parser

1. Copy src/bankstract/parsers/palmpay.py to src/bankstract/parsers/<bank>.py.
2. Implement detect() and parse() -> ParseResult from parsers/base.py. Populate total_credit / total_debit if the statement only ships header totals.
3. Add a Redactor subclass under src/bankstract/redactors/<bank>.py for the fixture pipeline.
4. Drop the raw statement at tests/<bank>/fixtures/_local/ (gitignored), then uv run bankstract redact <bank> <raw> tests/<bank>/fixtures/sample.pdf to produce the committable fixture.
5. Add tests under tests/<bank>/test_parser.py and tests/<bank>/test_redactor.py.

CI runs ruff + pyright (strict) + pytest. All three must pass clean. Reconciliation invariant must hold on every fixture.

Fixture PDFs must be redacted: account numbers, names, addresses, transaction IDs scrubbed. Never commit unredacted statements.

License

MIT. Author: logickoder.