bankstract 0.12.0

Convert Nigerian bank PDF statements into structured CSV.

bankstract

Convert Nigerian bank PDF + XLSX statements into structured CSV or JSON. Plugin architecture — one parser per bank, formats declared per parser.

pip install bankstract

bankstract palmpay statement.pdf -o out.csv
bankstract opay statement.xlsx -o out.json -f json
bankstract auto unknown.pdf -o out.csv
bankstract list                                # bank (formats)

Status

Bank	Formats	Status
PalmPay	PDF	v0.12 — alpha
First Bank	PDF	v0.12 — alpha
Zenith	PDF	v0.12 — alpha
OPay	PDF, XLSX	v0.12 — 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', 'opay', 'palmpay', 'zenith']
bankstract.list_redactors()           # ['fbn', 'opay', '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

# Parse + serialize in one call — byte-identical to the CLI's output.
csv_bytes  = bankstract.parse_to("statement.pdf")                   # default format="csv"
json_bytes = bankstract.parse_to(fp, format="json", bank="opay")    # explicit
debug_bytes = bankstract.parse_to(fp, reconcile=False)              # skip invariant

# Low-level writers — if you already hold a ParseResult.
from pathlib import Path
bankstract.write_csv(result.transactions, Path("out.csv"))
bankstract.write_json(result, Path("out.json"))

# Redact PII in-memory (no disk write); .data is the redacted file bytes.
redacted = bankstract.redact("statement.pdf")         # auto-detect bank
redacted = bankstract.redact(fp, bank="opay")         # explicit, stream input
redacted.data                                         # bytes — stream to HTTP / write to disk
redacted.report.redactions                            # count

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
parse_to	function	parse_to(source, *, format="csv", bank=None, reconcile=True) -> bytes — byte-identical to CLI
detect	function	detect(source) -> str | None (max-score bank)
list_parsers	function	sorted bank names (parsers)
write_csv	function	write_csv(transactions, target: Path | TextIO) -> int
write_json	function	write_json(result, target: Path | TextIO) -> int
redact	function	redact(source, *, bank=None) -> RedactResult — in-memory bytes
list_redactors	function	sorted bank names (redactors)
Parser	ABC	base class for new parsers
Redactor	ABC	base class for new redactors
Transaction	pydantic	row schema
StatementMetadata	dataclass	account holder / period / opening + closing balance
ParseResult	dataclass	transactions[], totals, format_version, metadata
RedactResult	dataclass	data: bytes, bank, format, format_version, report
RedactReport	dataclass	bank, pages, redactions, audit
Format	type alias	Literal["pdf", "xlsx"]
ParseError	exception	layout mismatch / undetectable source
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 / redactor with the highest detect_confidence score — ties resolve to registration order. redact() returns bytes in-memory: no tempfile, no disk write — callers stream the payload straight to HTTP responses, archives, or Path.write_bytes() as needed. Anything imported from a submodule prefixed with _ (bankstract._api, bankstract._pdfplumber, bankstract._xlsx, 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

See CONTRIBUTING.md for the full checklist: gate setup, shared helpers (parsers/_money.py, parsers/_columnar.py, _xlsx.py), supported_formats declaration, XLSX redactor dispatch, dual-fixture testing rule, fixture privacy, and the Conventional Commits release gate.

Quick form: copy parsers/palmpay.py (PDF-only) or parsers/opay.py (PDF + XLSX) as the template; reuse shared helpers; declare supported_formats; drop the raw statement at tests/<bank>/fixtures/_local/statement.{pdf,xlsx} (gitignored); redact into sample.{pdf,xlsx}; commit only the redacted sample.

CI runs ruff + pyright (strict) + pytest. All three must pass clean. Reconciliation invariant holds on every fixture (or the parser opts out via ParseResult.row_wise_reconcilable=False and supplies header totals for verify_totals).

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

License

MIT. Author: logickoder.