text-to-HTML conversion library/tool (python3 implementation)

 Markdown is a text-to-HTML conversion tool for web writers. Markdown
 allows you to write using an easy-to-read, easy-to-write plain text
 format, then convert it to structurally valid XHTML (or HTML).
 .
 This is a Python 3 implementation of John Gruber's Markdown. The current
 version of python3-markdown implements all Markdown syntax features and
 fully passes Markdown Test Suite 1.0. It also supports footnotes and
 attributes.