ci: daily Hacktoberfest 2026 prep tracker refresh (cron 11:50 UTC)

Adds .github/workflows/hacktoberfest_prep.yml (schedule: 50 11 * * *) and
scripts/hacktoberfest_prep_update.py. Each run:

- ticks tracked PR rows in docs/hacktober_2026_prep.md that are now
  merged/closed (`[ ]` -> `[x]`),
- rewrites an 'Automated statistics' section with the current open issue and
  open PR counts plus the top three directories with the most open
  'awaiting reviews' PRs,
- exits non-zero once Hacktoberfest 2026 has begun (>= 2026-10-01), so the
  prep window closing is loud and the job gets retired.

Standard library only; uses the Actions GITHUB_TOKEN. Refs #15081.

Author: priya-sundaram-dev

.github/workflows/hacktoberfest_prep.yml

@@ -0,0 +1,46 @@
+# Daily refresh of the Hacktoberfest 2026 open-PR cleanup tracker.
+# Ticks off any tracked pull request that has since been merged/closed, and
+# rewrites the "Automated statistics" section (open issue/PR counts + the top
+# three `awaiting reviews` directories). The job fails on purpose once
+# Hacktoberfest 2026 has begun (>= 2026-10-01), which is the signal to retire it.
+name: hacktoberfest_prep
+
+on:
+  schedule:
+    - cron: "50 11 * * *" # 11:50 UTC every day
+  workflow_dispatch: # allow a manual run while testing
+
+permissions:
+  contents: write
+
+jobs:
+  hacktoberfest-prep:
+    # No point running on forks — this pushes to the repo's own docs file.
+    if: github.repository == 'TheAlgorithms/Python'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v7
+      - uses: actions/setup-python@v7
+        with:
+          python-version-file: .python-version
+          allow-prereleases: true
+      - name: Update the tracker
+        id: update
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+        # Don't let the intentional post-Oct-1 failure stop the commit step;
+        # capture the exit code and re-raise it after pushing any changes.
+        run: |
+          set +e
+          python scripts/hacktoberfest_prep_update.py
+          echo "exit_code=$?" >> "$GITHUB_OUTPUT"
+      - name: Commit any changes
+        run: |
+          git config --global user.name "$GITHUB_ACTOR"
+          git config --global user.email "$GITHUB_ACTOR@users.noreply.github.com"
+          git add docs/hacktober_2026_prep.md
+          git commit -m "chore: refresh Hacktoberfest 2026 prep tracker" || echo "No changes to commit"
+          git push || echo "Nothing to push"
+      - name: Propagate the script's exit code
+        run: exit ${{ steps.update.outputs.exit_code }}

scripts/hacktoberfest_prep_update.py

@@ -0,0 +1,213 @@
+#!/usr/bin/env python3
+"""Refresh the Hacktoberfest 2026 open-PR cleanup tracker.
+
+This script is run once a day by the ``hacktoberfest_prep`` GitHub Actions
+workflow (see ``.github/workflows/hacktoberfest_prep.yml``). It:
+
+1. Reads ``docs/hacktober_2026_prep.md`` and, for every tracked pull request
+   that is still an unchecked ``[ ]`` box, checks whether the PR has since
+   been merged or closed. Resolved rows are ticked (``[ ]`` -> ``[x]``) and
+   annotated with ``merged`` / ``closed``.
+2. Rewrites a machine-generated ``## Automated statistics`` section at the end
+   of the file with the current number of open issues and open pull requests
+   and the top three algorithm directories that have the most open pull
+   requests labelled ``awaiting reviews``.
+3. Exits non-zero once Hacktoberfest 2026 has begun (on or after
+   2026-10-01, UTC), so the prep window closing is loud rather than silent.
+
+It only uses the standard library and the ``GITHUB_TOKEN`` provided by the
+Actions runner, so there is nothing to install.
+"""
+
+from __future__ import annotations
+
+import datetime as dt
+import json
+import os
+import re
+import sys
+import time
+import urllib.error
+import urllib.parse
+import urllib.request
+
+REPO = os.environ.get("GITHUB_REPOSITORY", "TheAlgorithms/Python")
+TOKEN = os.environ.get("GITHUB_TOKEN", "")
+API = "https://api.github.com"
+TRACKER = "docs/hacktober_2026_prep.md"
+AWAITING_LABEL = "awaiting reviews"
+HACKTOBERFEST_START = dt.date(2026, 10, 1)
+
+# A tracked row looks like: ``12. [ ] #15144 awaiting reviews``
+ROW_RE = re.compile(
+    r"^(?P<idx>\d+)\.\s+\[(?P<mark>[ x])\]\s+#(?P<pr>\d+)\b(?P<rest>.*)$"
+)
+STATS_HEADER = "## Automated statistics"
+
+
+def _request(url: str) -> tuple[dict | list, dict]:
+    """GET ``url`` and return ``(json_body, headers)``, retrying on 403/rate limit."""
+    headers = {
+        "Accept": "application/vnd.github+json",
+        "X-GitHub-Api-Version": "2022-11-28",
+        "User-Agent": "hacktoberfest-prep-bot",
+    }
+    if TOKEN:
+        headers["Authorization"] = f"Bearer {TOKEN}"
+    for attempt in range(4):
+        req = urllib.request.Request(url, headers=headers)  # noqa: S310
+        try:
+            with urllib.request.urlopen(req, timeout=30) as resp:  # noqa: S310
+                return json.load(resp), dict(resp.headers)
+        except urllib.error.HTTPError as exc:
+            remaining = exc.headers.get("X-RateLimit-Remaining")
+            if exc.code in (403, 429) and remaining == "0":
+                reset = int(exc.headers.get("X-RateLimit-Reset", "0"))
+                wait = max(1, reset - int(time.time())) + 1
+                print(f"Rate limited; sleeping {wait}s", file=sys.stderr)
+                time.sleep(min(wait, 90))
+                continue
+            if exc.code >= 500 and attempt < 3:
+                time.sleep(2 * (attempt + 1))
+                continue
+            raise
+    msg = f"giving up on {url}"
+    raise RuntimeError(msg)
+
+
+def _search_count(query: str) -> int:
+    url = f"{API}/search/issues?q={urllib.parse.quote(query)}&per_page=1"
+    body, _ = _request(url)
+    return int(body.get("total_count", 0))  # type: ignore[union-attr]
+
+
+def pr_state(number: int) -> str | None:
+    """Return ``"merged"`` / ``"closed"`` for a resolved PR, else ``None``."""
+    body, _ = _request(f"{API}/repos/{REPO}/pulls/{number}")
+    if body.get("state") == "open":  # type: ignore[union-attr]
+        return None
+    return "merged" if body.get("merged_at") else "closed"  # type: ignore[union-attr]
+
+
+def top_awaiting_directories(
+    limit: int = 3, max_prs: int = 400
+) -> list[tuple[str, int]]:
+    """Count open ``awaiting reviews`` PRs by the top-level directory they touch."""
+    query = f'repo:{REPO} is:pr is:open label:"{AWAITING_LABEL}"'
+    counts: dict[str, int] = {}
+    page = 1
+    scanned = 0
+    while scanned < max_prs:
+        url = (
+            f"{API}/search/issues?q={urllib.parse.quote(query)}"
+            f"&per_page=100&page={page}"
+        )
+        body, _ = _request(url)
+        items = body.get("items", [])  # type: ignore[union-attr]
+        if not items:
+            break
+        for item in items:
+            number = item["number"]
+            files, _ = _request(f"{API}/repos/{REPO}/pulls/{number}/files?per_page=100")
+            dirs = set()
+            for changed in files:  # type: ignore[union-attr]
+                parts = changed["filename"].split("/")
+                if len(parts) > 1 and not parts[0].startswith("."):
+                    dirs.add(parts[0])
+            for directory in dirs:
+                counts[directory] = counts.get(directory, 0) + 1
+            scanned += 1
+            if scanned >= max_prs:
+                break
+        if len(items) < 100:
+            break
+        page += 1
+    ranked = sorted(counts.items(), key=lambda kv: (-kv[1], kv[0]))
+    return ranked[:limit]
+
+
+def refresh_checkboxes(lines: list[str]) -> tuple[list[str], int]:
+    """Tick rows whose PR is now merged/closed. Returns (new_lines, n_updated)."""
+    updated = 0
+    out: list[str] = []
+    for line in lines:
+        match = ROW_RE.match(line)
+        if not match or match.group("mark") == "x":
+            out.append(line)
+            continue
+        state = pr_state(int(match.group("pr")))
+        if state is None:
+            out.append(line)
+            continue
+        out.append(f"{match.group('idx')}. [x] #{match.group('pr')} {state}")
+        updated += 1
+    return out, updated
+
+
+def build_stats_block() -> str:
+    open_issues = _search_count(f"repo:{REPO} is:issue is:open")
+    open_prs = _search_count(f"repo:{REPO} is:pr is:open")
+    awaiting = _search_count(f'repo:{REPO} is:pr is:open label:"{AWAITING_LABEL}"')
+    today = dt.datetime.now(dt.UTC).date().isoformat()
+    top_dirs = top_awaiting_directories()
+
+    lines = [
+        STATS_HEADER,
+        "",
+        f"_Generated automatically by "
+        f"`scripts/hacktoberfest_prep_update.py` on {today} (UTC)._",
+        "",
+        f"- **Open issues:** {open_issues}",
+        f"- **Open pull requests:** {open_prs}",
+        f"- **Open PRs labelled `{AWAITING_LABEL}`:** {awaiting}",
+        "",
+        "**Top three directories to work on** (most open pull requests labelled "
+        f"`{AWAITING_LABEL}`):",
+        "",
+    ]
+    if top_dirs:
+        for rank, (directory, count) in enumerate(top_dirs, start=1):
+            plural = "PR" if count == 1 else "PRs"
+            lines.append(f"{rank}. `{directory}/` — {count} awaiting-reviews {plural}")
+    else:
+        lines.append("_No open `awaiting reviews` pull requests found._")
+    lines.append("")
+    return "\n".join(lines)
+
+
+def splice_stats(text: str, stats_block: str) -> str:
+    idx = text.find(STATS_HEADER)
+    head = text[:idx].rstrip("\n") if idx != -1 else text.rstrip("\n")
+    return f"{head}\n\n{stats_block}\n"
+
+
+def main() -> int:
+    with open(TRACKER, encoding="utf-8") as handle:
+        text = handle.read()
+
+    body_before_stats = text.split(STATS_HEADER, 1)[0]
+    lines = body_before_stats.splitlines()
+    lines, n_updated = refresh_checkboxes(lines)
+    body = "\n".join(lines)
+
+    stats_block = build_stats_block()
+    new_text = splice_stats(body, stats_block)
+
+    with open(TRACKER, "w", encoding="utf-8") as handle:
+        handle.write(new_text)
+
+    print(f"Checked off {n_updated} newly-resolved pull request(s).")
+
+    today = dt.datetime.now(dt.UTC).date()
+    if today >= HACKTOBERFEST_START:
+        print(
+            f"Hacktoberfest 2026 has begun ({today} >= {HACKTOBERFEST_START}); "
+            "the prep window is over — failing on purpose so this job is retired.",
+            file=sys.stderr,
+        )
+        return 1
+    return 0
+
+
+if __name__ == "__main__":
+    raise SystemExit(main())