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''' |
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Download script for APMO |
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To run: |
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`python IMO/download_script/download.py` |
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''' |
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import re |
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import requests |
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from bs4 import BeautifulSoup |
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from tqdm import tqdm |
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from pathlib import Path |
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from requests.adapters import HTTPAdapter |
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from urllib3.util.retry import Retry |
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from urllib.parse import urljoin |
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def build_session( |
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max_retries: int = 3, |
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backoff_factor: int = 2, |
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session: requests.Session = None |
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) -> requests.Session: |
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""" |
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Build a requests session with retries |
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Args: |
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max_retries (int, optional): Number of retries. Defaults to 3. |
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backoff_factor (int, optional): Backoff factor. Defaults to 2. |
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session (requests.Session, optional): Session object. Defaults to None. |
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""" |
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session = session or requests.Session() |
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adapter = HTTPAdapter(max_retries=Retry(total=max_retries, backoff_factor=backoff_factor)) |
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session.mount("http://", adapter) |
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session.mount("https://", adapter) |
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session.headers.update({ |
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"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.3" |
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}) |
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return session |
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def main(): |
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base_url = "https://web.evanchen.cc/problems.html" |
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req_session = build_session() |
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output_dir = Path(__file__).parent.parent / "raw" |
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output_dir.mkdir(parents=True, exist_ok=True) |
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resp = req_session.get(base_url) |
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soup = BeautifulSoup(resp.text, 'html.parser') |
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imo_exams = soup.find_all("a", href=lambda h: h and re.search(r"IMO\-\d{4}\-notes.pdf$", h)) |
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imo_pdf_links = [urljoin(base_url, link["href"]) for link in imo_exams] |
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for link in tqdm(imo_pdf_links): |
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output_file = output_dir / f"en-{Path(link).name}" |
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if output_file.exists(): |
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continue |
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pdf_resp = req_session.get(link) |
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if pdf_resp.status_code != 200: |
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print(f"Failed to download {link}") |
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continue |
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output_file.write_bytes(pdf_resp.content) |
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if __name__ == "__main__": |
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main() |
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