diavgeia

A consolidated Python client for the Greek Δι@ύγεια (Diavgeia) OpenData API
Search, fetch, verify, harvest and publish acts of the Greek public sector.

---

Δι@ύγεια ("Clarity") is the Greek transparency programme: since 2010, every administrative act of the public sector must be published online with a unique ΑΔΑ (Αριθμός Διαδικτυακής Ανάρτησης) before it takes effect. That is millions of budget commitments, contracts, appointments and awards, all publicly queryable.

This package wraps the entire OpenData REST API behind one connection object.

from diavgeia import Diavgeia, Q

with Diavgeia() as dv:
    d = dv.decisions.get("ΡΒΠΕ7ΛΞ-Ν1Ζ")
    print(d.subject, d.issue_date, d.amount())

    contracts = Q.decision_type("Δ.1") & Q.subject("ΠΡΟΜΗΘΕΙΑ")
    for decision in dv.search.iter_advanced(contracts,
                                            from_issue_date="2024-01-01",
                                            to_issue_date="2024-12-31"):
        print(decision.ada, decision.amount(), decision.subject)

All read endpoints are public. Credentials are needed only to publish.

Install

pip install diavgeia
pip install 'diavgeia[pandas]'    # adds DataFrame export

From a checkout:

git clone https://github.com/petroud/diavgeia-client
cd diavgeia-client
pip install -e '.[dev]'

Why this exists

There are thinner wrappers around this API. Two server behaviours are the reason for a thicker one — both silently return wrong data rather than an error.

1. The 180-day clamp

Ask for a range longer than 180 days and the API does not complain. It rewrites the end of your range to from + 180 days and answers with a subset. Measured against the live production API, one municipality across 2023:

Request	Decisions returned
One search call for 2023-01-01 … 2023-12-31	1 437 — server clamped to 30 Jun
search.iter() / search.count(), same range	3 359

clamped = dv.search.simple(org="6067", from_issue_date="2023-01-01",
                           to_issue_date="2023-12-31", size=1)
clamped.total        # 1437
clamped.info.query   # ...issueDate:[DT(2023-01-01…) TO DT(2023-06-30…)]  ← rewritten

dv.search.count(org="6067", from_issue_date="2023-01-01",
                to_issue_date="2023-12-31")   # 3359

The iter, all, count and harvest helpers split a long span into contiguous, non-overlapping windows the server will honour, page through each and de-duplicate by ΑΔΑ. You get the range you asked for. See docs/gotchas.md.

2. The page-size cap

size is capped at 500 anonymously and 1 000 when authenticated. Larger values are clamped without a warning. Pagination follows the size the server actually used (info.size), so a clamped request cannot make a harvest stop after a single page.

What's in the box

Connection object	Pooled session, Basic auth, retries with jittered backoff, courtesy rate limiter, typed exception hierarchy
Complete coverage	Every endpoint in the published docs, including submit / publish / corrected copy / revocation
Typed models	Frozen dataclasses; epoch millis → tz-aware Europe/Athens datetimes; raw payload always preserved in .raw; unknown fields never break parsing
Query builder	Q composes advanced-search expressions with & / |, parenthesising by precedence — unbalanced brackets and quote-injection from Greek free text are impossible
Harvesting	Automatic window splitting + pagination, flat memory, resumable JSONL bulk export
Label resolution	id → name via a cached, optionally disk-backed catalog
Verified downloads	Checks the SHA-1 Diavgeia publishes; never leaves a partial file behind
Local validation	Validates a payload against its decision type's extra-field schema before publishing
Cursors	Resumable positions in a sweep, encodable to an opaque token and picked up in another process
Container protocol	dv.organizations["6067"], [0:10], len(), iteration, find(), IPython tab-completion
Archive export	Folder tree of metadata + PDFs + attachments, layout of your choosing, resumable
CLI	diavgeia search / get / doc / harvest / orgs / types / dict

Documentation

Guide
Getting started	Install, connect, configure, first queries
Searching	Simple and advanced search, counting, streaming, harvesting
Cursors	Holding, checkpointing and resuming a position
Collections & proxies	Resources as Python containers; lazy entity proxies
Query language	The Q builder and the underlying grammar
Decisions & documents	Fetching acts, version logs, PDFs, checksums
Org chart	Bodies, units, signers, positions
Reference data	Decision types, extra-field schemas, dictionaries
Publishing	Submit, publish, correct, revoke, validate
Archiving	Exporting to a folder tree with PDFs and attachments
CLI	Every command and flag
Gotchas	The 180-day clamp, page caps, timestamps, Greek text
API reference	Every class and method

There is also a runnable tour: examples/diavgeia_quickstart.ipynb.

At a glance

from diavgeia import Diavgeia, Q

dv = Diavgeia(cache_dir="~/.cache/diavgeia")

# --- search ------------------------------------------------------------
page = dv.search.simple(org="6067", from_issue_date="2024-01-01",
                        to_issue_date="2024-03-31", size=100)
page.total
page.info.query          # the query the server actually ran

for d in dv.search.iter(org="6067", from_issue_date="2020-01-01",
                        to_issue_date="2024-12-31"):
    ...                  # windows + pages handled; memory stays flat

# --- advanced query ----------------------------------------------------
q = (Q.decision_type("Β.1.2", "Β.1.3")
     & Q.status("REVOKED", "PENDING_REVOCATION")
     & (Q.organization_latin_name("minedu") | Q.organization("10")))
dv.search.advanced(q, size=50)

# --- one decision ------------------------------------------------------
d = dv.decisions.get("ΡΒΠΕ7ΛΞ-Ν1Ζ")
d.subject, d.issue_date, d.status, d.amount(), d.related_adas()
dv.decisions.version_log(d.ada)                # corrections and revocations
dv.decisions.download_document(d.ada, "out/", verify_checksum=True)
dv.decisions.get_many(adas, max_workers=8)     # concurrent, order preserved

# --- org chart ---------------------------------------------------------
dv.organizations.find("δημος γορτυνασ")        # accent- and case-insensitive
dv.organizations.units("6067")
dv.organizations.signers("6067")

# --- reference data ----------------------------------------------------
dv.types.details("Β.1.3").extra_fields
dv.dictionaries.get("FEKTYPES")

# --- resolve and export ------------------------------------------------
dv.describe(d)                                 # ids → labels
dv.export_jsonl(decisions, "acts.jsonl")
dv.export_csv(decisions, "acts.csv")           # UTF-8 BOM, Excel-safe Greek
dv.to_dataframe(decisions)

# --- browse collections like containers --------------------------------
len(dv.organizations)                          # 5417
dv.organizations["6067"], dv.organizations["odegortynas"], dv.organizations[0:5]
dv.types["Β.1.3"].extra_fields                 # indexing loads the full schema
dv.dictionaries["THK"].as_mapping()

# --- cursors: hold a position, resume it later -------------------------
cursor = dv.search.cursor(org="6067", from_issue_date="2020-01-01",
                          to_issue_date="2024-12-31")
page = cursor.next_page()
token = cursor.to_token()                      # store anywhere
cursor = dv.search.resume(token)               # ... continue, another process

# --- resumable bulk harvest -------------------------------------------
dv.harvest("2020-2024.jsonl", from_issue_date="2020-01-01",
           to_issue_date="2024-12-31", org="6067")

# --- or a full archive: metadata + PDFs + attachments ------------------
dv.export_archive("archive/gortyna", org="6067",
                  from_issue_date="2023-01-01", to_issue_date="2024-12-31",
                  layout="org/year",     # 6067-ΔΗΜΟΣ ΓΟΡΤΥΝΑΣ/2024/<ΑΔΑ>/
                  documents=True, attachments=True)

Command line

diavgeia get ΡΒΠΕ7ΛΞ-Ν1Ζ --labels
diavgeia search --org 6067 --from 2024-01-01 --to 2024-06-30 -n 20
diavgeia search --org 6067 --from 2023-01-01 --to 2023-12-31 --count
diavgeia query 'decisionTypeUid:"Β.1.3"' --from 2024-01-01 --to 2024-03-31
diavgeia doc ΡΒΠΕ7ΛΞ-Ν1Ζ -o ./pdfs --verify
diavgeia harvest acts.jsonl --from 2023-01-01 --to 2023-12-31 --org 6067
diavgeia orgs "δημος γορτυνασ"
diavgeia types Β.1.3          # print the extra-field schema
diavgeia dict THK

Full reference: docs/cli.md.

Publishing

dv = Diavgeia(environment="test", username="10599_api", password="…")

problems = dv.validate_metadata(metadata)                  # local schema check
dv.decisions.verify(metadata, document="decision.pdf")     # server dry-run
decision = dv.decisions.publish(metadata, document="decision.pdf",
                                attachments=[("annex.xlsx", "Συνοδευτικό")])
print(decision.ada)

validate_metadata() complements rather than replaces verify(): cross-entity rules (may this signer sign for this unit?) can only be answered server-side. See docs/publishing.md.

Development

make install-dev       # pip install -e '.[dev,pandas]'
make check             # lint + typecheck + offline tests — the pre-commit gate

make on its own lists every target:

Target
test / test-live / test-all	217 offline tests; 30 live contract tests; both
coverage	offline suite with an HTML report
lint / format / typecheck	ruff check; ruff fix + format; mypy
check	lint + typecheck + test
notebook	regenerate the example notebook from its source
version / bump-patch / bump-minor / bump-major	version, kept in sync across pyproject.toml and __init__.py
clean / build / upload	artefacts; sdist + wheel; PyPI
release	check, bump the patch version, build

The offline suite injects a stub session, so it exercises the real transport — retries, error mapping, encoding — without touching the network. Fixtures are the payloads from the official documentation. Live tests assert on the shape of responses rather than specific values, so they survive a changing corpus but fail loudly if the API's contract shifts.

To regenerate the example notebook after editing its cells:

python examples/build_notebook.py

Project layout

src/diavgeia/
  client.py        the Diavgeia connection object, validation, export, harvest
  _http.py         transport: session, auth, retries, rate limiting, errors
  models.py        frozen dataclasses for every entity
  entities.py      Field descriptor, entity proxies, the container protocol
  cursor.py        resumable search cursors and their tokens
  archive.py       the folder-tree exporter
  query.py         the Q advanced-search builder
  paging.py        date-window splitting and pagination
  catalog.py       cached reference data and id → label resolution
  autocomplete.py  IPython key completion for collections
  cli.py           the command-line interface
  resources/       decisions, search, orgchart, reference
scripts/
  bump_version.py  keeps pyproject.toml and __init__.py in step

Known limitations

• Advanced search accepts only a single 180-day window per request; harvesting a longer span requires the explicit from_issue_date / to_issue_date arguments to iter_advanced() (or a cursor), which append an issueDate criterion per window.
• A cursor token records its position, not the ΑΔΑs already emitted. De-duplication is exact within a process; across a resume, boundary records can repeat. harvest() and export_archive() de-duplicate against their own output, so this only affects hand-rolled sinks.
• search.count() costs one request per 180-day window. Counting a decade is 21 requests.

Reference

• Upstream API documentation: https://diavgeia.gov.gr/api/help
• Official sample clients (PHP / Java / Python): https://github.com/diavgeia
• Base URLs: https://diavgeia.gov.gr/opendata (production), https://test3.diavgeia.gov.gr/luminapi/opendata (pilot)

Authors

Dimitris Petrou (@petroud) — author and maintainer. See AUTHORS.md for contribution guidelines.

Licence

MIT. This is an independent client library, not an official product of the Greek Ministry of Digital Governance.