[ExcaliburZero]

Plotnine is quite nice. Its api is very similar to R's ggplot so it gives you the same level of expressiveness and flexibility while being able to stay the Python ecosystem to use numpy, pandas, etc..

[ObscureMind]

The authors also provide a reimplementation of dplyr in Python that integrates well with plotnine: https://github.com/has2k1/plydata