markdown-it-py

https://github.com/executablebooks/markdown-it-py

Markdown parser done right.

• Follows the CommonMark spec for baseline parsing
• Configurable syntax: you can add new rules and even replace existing ones.
• Pluggable: Adds syntax extensions to extend the parser (see the plugin list).
• High speed (see our benchmarking tests)
• Easy to configure for security
• Member of Google's Assured Open Source Software

What I switched to for notes.billmill.org after starting with python-markdown, along with mdit-py-plugins for additional functionality.

There is a beta rust version markdown-it-pyrs, however it cannot have python plugins at the moment.