vgplot

A Python API for authoring Mosaic visualizations. Build declarative, interactive plots backed by DuckDB — in notebooks, as JSON specs, or as part of a data pipeline.

vgplot produces Mosaic View objects that can be rendered with mosaic-widget or exported to JSON for use in a browser. Data sources and parameters defined as local variables are automatically discovered at render time.

Installation

pip install vgplot

To render visualizations in the widget, install the widget:

pip install mosaic-widget

Usage

File-based data

Load data from a file using vg.parquet(), vg.csv(), or vg.table(), pass it directly to a mark, then call view.show() or view:

import vgplot as vg

athletes = vg.parquet("data/athletes.parquet")

view = vg.plot(
    vg.dot(athletes, x="weight", y="height", fill="sex", opacity=0.5),
    vg.width(600),
    vg.height(400),
)

view

Interactive selections

Params and selections are first-class objects. Declare them before the view so they can be referenced by multiple marks or interactors:

import vgplot as vg

flights = vg.parquet("data/flights-200k.parquet")
brush = vg.selection.crossfilter()

view = vg.vconcat(
    vg.plot(
        vg.rect_y(flights, x=vg.bin("delay"), y=vg.count(),
                  filter_by=brush, fill="steelblue",
                  inset_left=0.5, inset_right=0.5),
        vg.interval_x(bind=brush),
        vg.x_domain("Fixed"),
        vg.x_label("Arrival Delay (min)"),
        vg.height(200),
    ),
    vg.plot(
        vg.rect_y(flights, x=vg.bin("time"), y=vg.count(),
                  filter_by=brush, fill="steelblue",
                  inset_left=0.5, inset_right=0.5),
        vg.interval_x(bind=brush),
        vg.x_domain("Fixed"),
        vg.x_label("Departure Time (hour)"),
        vg.height(200),
    ),
)

view

Scalar params and input widgets

Use vg.param() for scalar parameters bound to input controls:

import vgplot as vg

walk = vg.parquet("data/random-walk.parquet")
bias = vg.param(0)

view = vg.vconcat(
    vg.slider(label="Bias", bind=bias, min=0, max=1000, step=1),
    vg.plot(
        vg.area_y(walk, x="t", y=vg.sql("v + $bias")),
        vg.width(680),
        vg.height(200),
    ),
)

view

Key concepts

Concept	Python API
File-based data	`vg.parquet(path)`, `vg.csv(path)`, `vg.spatial(path)`, `vg.table(query)`
Mark	`vg.dot(...)`, `vg.bar_y(...)`, `vg.area_y(...)`, `vg.line_y(...)`, …
Aggregation / transform	`vg.count()`, `vg.bin("col")`, `vg.avg("col")`, `vg.sum("col")`, …
SQL expression	`vg.sql("expr")` — use `$param` to interpolate a param, e.g. `vg.sql("v + $bias")`
Plot attributes	`vg.width(n)`, `vg.height(n)`, `vg.x_label("…")`, `vg.color_scheme("…")`, …
Interactor	`vg.interval_x(...)`, `vg.interval_xy(...)`, `vg.region(...)`, `vg.highlight(...)`, …
Layout	`vg.vconcat(...)`, `vg.hconcat(...)`, `vg.vspace(n)`, `vg.hspace(n)`
Crossfilter selection	`vg.selection.crossfilter()`
Intersect / union selection	`vg.selection.intersect()`, `vg.selection.union()`
Scalar param	`vg.param(value)`
Input widgets	`vg.slider(...)`, `vg.menu(...)`, `vg.select(...)`, `vg.checkbox(...)`
Named data reference	`vg.source("table_name")`
Render	`view.show()` or `view` as last cell expression in notebooks

Option names match the vgplot API reference, but in snake_case. For example, xDomain → x_domain, colorScheme → color_scheme, filterBy → filter_by.

Any mark or directive not listed above is also accessible by its snake_case name — vg.regression_y(...) and vg.x_tick_rotate(45) work without explicit exports.

Exporting specs

view.to_dict() returns a plain Python dictionary. view.to_json() returns a JSON string:

from pprint import pprint

pprint(view.to_dict())
print(view.to_json(indent=2))

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Release history Release notifications | RSS feed

0.30.0

Aug 9, 2026

This release

0.29.1

Jul 16, 2026

0.29.0

Jul 14, 2026

0.1.0

Apr 7, 2026

vgplot 0.29.1

vgplot

Installation

Usage

File-based data

Interactive selections

Scalar params and input widgets

Key concepts

Exporting specs

Project links

Key dates

2 maintainers

GitHub Statistics

Requires

Download files

Source Distribution

Built Distribution

File details

File metadata

File hashes

Provenance

File details

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File hashes

Provenance

Release history Release notifications | RSS feed