[bocklund]

Seaborn is based on matplotlib and has basically the same semantics of matplotlib with better styling defaults and a wider API for different plots.

For a ggplot grammar-of-graphics style library in Python, I really like Altair: https://altair-viz.github.io/

[krastanov]

The semantics differ and the API is actually more restricted (and friendly), not wider, but yes, I agree it is not grammar of graphics. However, as much as I love the grammar of graphics, it is important to point out there are other good ways to make stat plots besides it. Seaborne, bokeh, statsplots.jl, algebraofgraphics.jl, and others.