eurlxp 0.3.1

A modern EUR-Lex parser for Python - fetch and parse EU legal documents

eurlxp

A modern EUR-Lex parser for Python. Fetch and parse EU legal documents with async support, type hints, and a CLI.

Note: This is a modern rewrite inspired by kevin91nl/eurlex, built with UV, httpx, Pydantic, and Typer.

Features

• Modern Python - Supports Python 3.10-3.14
• Async support - Fetch multiple documents concurrently
• Type hints - Full type annotations for IDE support
• CLI - Command-line interface with Typer
• Pydantic models - Validated, structured data
• Drop-in compatible - Same API as the original eurlex package
• Bot detection handling - Browser-like headers and WAF challenge detection
• Rate limiting - Configurable delays between requests
• SPARQL support - Alternative data source that bypasses HTML scraping

Installation

# Using pip
pip install eurlxp

# Using uv
uv add eurlxp

# With SPARQL support (required for get_celex_dataframe, run_query, get_regulations, etc.)
pip install eurlxp[sparql]
# or
uv add eurlxp[sparql]

Note: SPARQL functions (get_celex_dataframe, run_query, get_regulations, get_documents, guess_celex_ids_via_eurlex) require the optional sparql dependencies. If you see ImportError: SPARQL dependencies not installed, install with pip install eurlxp[sparql].

How It Works

This package fetches EU legal documents from EUR-Lex using their public HTML endpoints:

https://eur-lex.europa.eu/legal-content/{LANG}/TXT/HTML/?uri=CELEX:{CELEX_ID}

You can verify this manually with curl:

# Fetch a regulation (EU Drone Regulation 2019/947)
curl -s "https://eur-lex.europa.eu/legal-content/EN/TXT/HTML/?uri=CELEX:32019R0947" | head -50

# Or with a different language (German)
curl -s "https://eur-lex.europa.eu/legal-content/DE/TXT/HTML/?uri=CELEX:32019R0947" | head -50

The equivalent using this package's CLI:

# Fetch as HTML
uvx eurlxp fetch 32019R0947 --format html | head -50

# Fetch and parse to JSON
uvx eurlxp fetch 32019R0947 --format json | head -30

# Fetch and parse to CSV
uvx eurlxp fetch 32019R0947 --format csv | head -10

# Get document info (shows row count, articles, etc.)
uvx eurlxp info 32019R0947

Quick Start

from eurlxp import get_html_by_celex_id, parse_html, WAFChallengeError

# Fetch and parse a regulation
celex_id = "32019R0947"
try:
    html = get_html_by_celex_id(celex_id)
    df = parse_html(html)

    # Get Article 1
    df_article_1 = df[df.article == "1"]
    print(df_article_1.iloc[0].text)
    # "This Regulation lays down detailed provisions for the operation of unmanned aircraft systems..."
except WAFChallengeError:
    print("Bot detection triggered - try using SPARQL functions instead")

Async Usage

import asyncio
from eurlxp import AsyncEURLexClient, parse_html

async def fetch_documents():
    # Use rate limiting to avoid bot detection
    async with AsyncEURLexClient(request_delay=2.0) as client:
        # Fetch multiple documents concurrently
        docs = await client.fetch_multiple(["32019R0947", "32019R0945"])
        for celex_id, html in docs.items():
            df = parse_html(html)
            print(f"{celex_id}: {len(df)} rows")

asyncio.run(fetch_documents())

Handling Bot Detection

EUR-Lex uses AWS WAF (Web Application Firewall) with JavaScript challenges to detect automated requests. This cannot be bypassed in pure Python because it requires JavaScript execution to solve a cryptographic puzzle. The library provides several strategies:

from eurlxp import EURLexClient, ClientConfig, WAFChallengeError

# Strategy 1: Automatic SPARQL fallback (recommended)
# When WAF blocks HTML scraping, automatically fetch metadata via SPARQL
config = ClientConfig(sparql_fallback=True)
with EURLexClient(config=config) as client:
    html = client.get_html_by_celex_id("32019R0947")  # Falls back to SPARQL if blocked

# Strategy 2: Use rate limiting to avoid triggering WAF
with EURLexClient(request_delay=2.0) as client:  # 2 second delay between requests
    html = client.get_html_by_celex_id("32019R0947")

# Strategy 3: Use custom configuration
config = ClientConfig(
    request_delay=3.0,           # Delay between requests
    use_browser_headers=True,    # Use browser-like headers (default)
    referer="https://eur-lex.europa.eu/",  # Add referer header
)
with EURLexClient(config=config) as client:
    html = client.get_html_by_celex_id("32019R0947")

# Strategy 4: Handle WAF challenges manually
try:
    html = get_html_by_celex_id("32019R0947")
except WAFChallengeError:
    # Fall back to SPARQL manually
    from eurlxp import get_documents
    docs = get_documents(types=["REG"], limit=10)

# Strategy 5: Disable WAF exception (get raw challenge HTML)
config = ClientConfig(raise_on_waf=False)
with EURLexClient(config=config) as client:
    html = client.get_html_by_celex_id("32019R0947")  # Returns challenge HTML if blocked

Why can't we bypass WAF in Python? AWS WAF requires a real browser to execute JavaScript that solves a cryptographic challenge and sets a cookie. HTTP libraries like httpx can't execute JavaScript. For browser automation, consider Playwright or Selenium, but SPARQL is the cleaner solution.

Using SPARQL (Recommended for Bulk Data)

The SPARQL endpoint (https://publications.europa.eu/webapi/rdf/sparql) doesn't trigger bot detection and is ideal for bulk operations. It's the recommended approach when HTML scraping is blocked.

from eurlxp import get_documents, get_regulations, run_query, guess_celex_ids_via_eurlex

# Convert slash notation to CELEX ID (uses SPARQL, not HTML scraping)
celex_ids = guess_celex_ids_via_eurlex("2019/947")
# Returns: ['32019R0947']

# Get list of regulations (returns CELLAR IDs)
cellar_ids = get_regulations(limit=100)

# Get documents with metadata
docs = get_documents(types=["REG", "DIR"], limit=50)
for doc in docs:
    print(f"{doc['celex']}: {doc['date']} - {doc['type']}")

# Run custom SPARQL queries
results = run_query("""
    SELECT ?doc ?celex WHERE {
        ?doc cdm:resource_legal_id_celex ?celex .
    } LIMIT 10
""")

SPARQL functions include automatic retry with exponential backoff for handling temporary 503 errors:

from eurlxp import run_query, SPARQLServiceError

try:
    # Automatic retry: 3 attempts with 2s, 4s, 8s delays
    results = run_query(query)
    
    # Or customize retry behavior
    results = run_query(query, max_retries=5, retry_delay=3.0)
except SPARQLServiceError as e:
    print(f"SPARQL endpoint unavailable: {e}")

Note: SPARQL functions require pip install eurlxp[sparql]

CLI Usage

# Fetch a document
eurlxp fetch 32019R0947 -o regulation.html

# Parse and convert to CSV
eurlxp fetch 32019R0947 -f csv -o regulation.csv

# Get document info
eurlxp info 32019R0947

# Convert slash notation to CELEX ID
eurlxp celex 2019/947
# Output: 32019R0947

API Reference

Functions

Function	Description
get_html_by_celex_id(celex_id, language="en")	Fetch HTML by CELEX ID
get_html_by_cellar_id(cellar_id, language="en")	Fetch HTML by CELLAR ID
parse_html(html)	Parse HTML to DataFrame
get_celex_id(slash_notation, document_type="R", sector_id="3")	Convert slash notation to CELEX ID
get_possible_celex_ids(slash_notation)	Get all possible CELEX IDs

Classes

Class	Description
EURLexClient	Synchronous HTTP client with rate limiting and WAF detection
AsyncEURLexClient	Asynchronous HTTP client with rate limiting and WAF detection
ClientConfig	Configuration dataclass for client behavior
WAFChallengeError	Exception raised when bot detection is triggered

ClientConfig Options

Option	Type	Default	Description
timeout	float	30.0	Request timeout in seconds
headers	dict	None	Custom headers to merge with defaults
request_delay	float	0.0	Delay between requests (rate limiting)
use_browser_headers	bool	True	Use browser-like headers to avoid detection
referer	str	None	Optional referer header
raise_on_waf	bool	True	Raise exception on WAF challenge
sparql_fallback	bool	True	Auto-fallback to SPARQL when WAF blocks requests

DataFrame Columns

Column	Description
text	The text content
type	Content type (text, link, etc.)
document	Document title
article	Article number
article_subtitle	Article subtitle
paragraph	Paragraph number
group	Group heading
section	Section heading
ref	Reference path (e.g., ["(1)", "(a)"])

Development

# Clone the repository
git clone https://github.com/morrieinmaas/eurlxp.git
cd eurlxp

# Install with dev dependencies
uv sync --all-extras

# Run tests
uv run pytest

# Run linting
uv run ruff check src tests
uv run ruff format src tests

# Type checking
uv run pyright

Publishing to PyPI

# Build the package
uv build

# Publish to PyPI (requires PYPI_TOKEN)
uv publish --token $PYPI_TOKEN

License

MIT License - see LICENSE for details.

Credits

Inspired by kevin91nl/eurlex.