Implement script to update python versions

Author: quantum5

.github/workflows/update-versions.yml

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+name: update-versions
+on:
+  schedule:
+    - cron: '0 0 * * *'
+jobs:
+  build:
+    if: github.repository == 'DMOJ/runtimes-python'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Set up Python 3.14
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.14'
+      - name: Installing dependencies
+        run: pip install -r requirements.txt
+      - name: Update python versions
+        run: |
+          sed -i '/python-version:/c\        python-version: [ '"$(python get_versions.py | tr '\n' , | sed 's/,$//;s/,/, /g')"' ]' .github/workflows/build.yml
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v4
+        with:
+          author: dmoj-build <build@dmoj.ca>
+          committer: dmoj-build <build@dmoj.ca>
+          commit-message: 'update python versions'
+          title: 'update python versions'
+          body: This PR has been auto-generated to update the python versions in `build` action.
+          reviewers: Xyene, quantum5, kiritofeng
+          branch: update-versions

get_versions.py

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+import re
+
+import requests
+from bs4 import BeautifulSoup
+
+reversion = re.compile(r'\d+\.\d+(?:\.\d+)?/$')
+
+
+def main():
+    downloads = requests.get('https://www.python.org/downloads/')
+    downloads.raise_for_status()
+
+    wanted = []
+    soup = BeautifulSoup(downloads.content, 'html.parser')
+    version_rows = soup.find('div', class_='active-release-list-widget').find('ol', class_='list-row-container')
+    for row in version_rows.find_all('li'):
+        branch = row.find('span', class_='release-version').text
+        status = row.find('span', class_='release-status').text
+        if status in ('bugfix', 'security'):
+            wanted.append(tuple(map(int, branch.split('.'))))
+
+    ftp = requests.get('https://www.python.org/ftp/python/')
+    ftp.raise_for_status()
+
+    soup = BeautifulSoup(ftp.content, 'html.parser')
+
+    releases = {}
+    for version in soup.find_all('a'):
+        href = version['href']
+        if reversion.match(href):
+            release = tuple(map(int, href.rstrip('/').split('.')))
+            branch = (release[0], release[1])
+            if branch in wanted:
+                if branch in releases:
+                    releases[branch] = max(releases[branch], release)
+                else:
+                    releases[branch] = release
+
+    for _, release in sorted(releases.items()):
+        print('.'.join(map(str, release)))
+
+
+if __name__ == '__main__':
+    main()

requirements.txt

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+BeautifulSoup4
+requests