/usr/lib/python3/dist-packages/markdown/extensions/ is in python3-markdown 2.6.9-1.
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/usr/lib/python3/dist-packages/markdown/extensions/__init__.py
/usr/lib/python3/dist-packages/markdown/extensions/abbr.py
/usr/lib/python3/dist-packages/markdown/extensions/admonition.py
/usr/lib/python3/dist-packages/markdown/extensions/attr_list.py
/usr/lib/python3/dist-packages/markdown/extensions/codehilite.py
/usr/lib/python3/dist-packages/markdown/extensions/def_list.py
/usr/lib/python3/dist-packages/markdown/extensions/extra.py
/usr/lib/python3/dist-packages/markdown/extensions/fenced_code.py
/usr/lib/python3/dist-packages/markdown/extensions/footnotes.py
/usr/lib/python3/dist-packages/markdown/extensions/headerid.py
/usr/lib/python3/dist-packages/markdown/extensions/meta.py
/usr/lib/python3/dist-packages/markdown/extensions/nl2br.py
/usr/lib/python3/dist-packages/markdown/extensions/sane_lists.py
/usr/lib/python3/dist-packages/markdown/extensions/smart_strong.py
/usr/lib/python3/dist-packages/markdown/extensions/smarty.py
/usr/lib/python3/dist-packages/markdown/extensions/tables.py
/usr/lib/python3/dist-packages/markdown/extensions/toc.py
/usr/lib/python3/dist-packages/markdown/extensions/wikilinks.py