/pyobsplot

Observable Plot in Jupyter notebooks and Quarto documents

Primary LanguageHTMLMIT LicenseMIT

pyobsplot

PyPI npm Tests Documentation Open In Colab

pyobsplot allows to use Observable Plot to create charts in Jupyter notebooks, VSCode notebooks, Google Colab and Quarto documents. Plots are created from Python code with a syntax as close as possible to the JavaScript one.

It allows to do things like :

import polars as pl
from pyobsplot import Plot

penguins = pl.read_csv("https://github.com/juba/pyobsplot/raw/main/doc/data/penguins.csv")

Plot.plot({
    "grid": True,
    "color": {"legend": True},
    "marks": [
        Plot.dot(
            penguins, 
            {"x": "flipper_length_mm", "y": "body_mass_g", "fill": "species"}
        ),
        Plot.density(
            penguins, 
            {"x": "flipper_length_mm", "y": "body_mass_g", "stroke": "species"}
        )
    ]
})

Sample plot screenshot

Installation and usage

pyobsplot can be installed with pip:

pip install pyobsplot

For usage instructions, see the documentation website:

If you just want to try this package without installing it on your computer, you can open an introduction notebook in Google Colab:

Features and limitations

Features:

  • Syntax as close as possible to the JavaScript one
  • Two renderers available: widget, which generates plots as Jupyter widgets, and jsdom, which generates SVG or HTML outputs
  • Pandas and polars DataFrame and Series objects are serialized using Arrow IPC format for improved speed and better data type conversions
  • Works offline, no iframe or dependency to Observable runtime
  • Caching mechanism of data objects if they are used several times in the same plot
  • Custom JavaScript code can be passed as strings with the js method
  • Python date and datetime objects are automatically converted to JavaScript Date objects
  • Works with Jupyter notebooks and Quarto HTML documents. Plots without legends are also supported in PDF and docx outputs with the jsdom renderer.
  • Plots can be saved to SVG or HTML files

Limitations:

  • Plot interactions (tooltips, crosshair...) are not available with the jsdom renderer (juba#16).
  • Plots with legends don't work in Quarto in formats other than HTML. (juba#9)
  • Very limited integration with IDE (documentation and autocompletion) for Plot methods. (juba#13)

Credits