pydygraphs

Python wrapper for the dygraphs JavaScript charting library.

Core port of the R dygraphs package — all 44 exported R functions ported to a Pythonic builder API. The R package (by RStudio/JJ Allaire) is the most mature dygraphs wrapper in any language; pydygraphs faithfully ports its API design, data model, and test coverage to Python.

Framework-agnostic core with adapters for Plotly Dash and Shiny for Python.

Features

• Two API styles: builder chaining (Dygraph(df).options(...).series(...)) and declarative (Dygraph(df, options=Options(...), series=[Series(...)])) — both produce identical output
• Full R port: options, axes, series, legend, highlight, annotations, shadings, events, limits, range selector, roller, callbacks
• Advanced plotters: bar chart, stacked bar, candlestick, multi-column, stem, filled line, error fill + group variants
• Plugins: unzoom, crosshair, ribbon, rebase
• Error bars: symmetric, custom (low/mid/high), fractions with Wilson intervals
• Zoom sync across multiple charts (line + stacked bar)
• Stacked bar chart with interactive canvas range selector
• Modebar overlay (Plotly-style) with PNG download and reset zoom buttons
• Standalone HTML export via .to_html() — no server needed
• dash-capture compatible via dygraph_strategy()
• Framework-agnostic: core builder has zero Dash/Shiny imports
• Flexible data input: DataFrame, Series, dict, list, numpy array, CSV string, CSV file
• Type-safe: full type hints, py.typed, passes ty and ruff

Installation

pip install pydygraphs            # core only
pip install pydygraphs[dash]      # + Plotly Dash adapter
pip install pydygraphs[shiny]     # + Shiny for Python adapter

Quick Start

Builder API (chaining)

import pandas as pd
from pydygraphs import Dygraph

df = pd.DataFrame(
    {"temp": [10, 12, 11, 14, 13], "rain": [5, 3, 7, 2, 6]},
    index=pd.date_range("2024-01-01", periods=5, freq="D"),
)

chart = (
    Dygraph(df, title="Weather")
    .options(fill_graph=True, draw_points=True, colors=["#00d4aa", "#f4a261"])
    .axis("y", label="Value")
    .series("temp", stroke_width=2)
    .legend(show="always")
    .range_selector(height=30)
)

Declarative API

from pydygraphs import Dygraph, Options, Series, Axis, Legend, RangeSelector

chart = Dygraph(
    df,
    title="Weather",
    options=Options(fill_graph=True, draw_points=True, colors=["#00d4aa", "#f4a261"]),
    axes=[Axis("y", label="Value")],
    series=[Series("temp", stroke_width=2)],
    legend=Legend(show="always"),
    range_selector=RangeSelector(height=30),
)

Dicts work too — mix freely:

chart = Dygraph(
    df,
    title="Weather",
    options={"fill_graph": True},
    series=[Series("temp", color="red"), {"name": "rain", "axis": "y2"}],
)

Render in Dash

from dash import Dash, html
app = Dash(__name__)
app.layout = html.Div([chart.to_dash(app=app)])

Render in Shiny

from pydygraphs.shiny import dygraph_ui, render_dygraph

# In UI:
dygraph_ui("my-chart")

# In server:
await render_dygraph(session, "my-chart", chart)

Standalone HTML

html_string = chart.to_html()
Path("chart.html").write_text(html_string)

Data Input

Utility Methods

chart.update(legend={"show": "follow"})  # modify config after construction
forked = chart.copy()                     # deep copy for variants
config = chart.to_dict()                  # plain dict (framework-agnostic)
json_str = chart.to_json()                # JSON with JS functions

Error Bars

from pydygraphs import Dygraph, make_error_bar_data

data = make_error_bar_data(x=[1,2,3], y=[10,20,30], error=[1,2,3])
chart = Dygraph(data, options={"error_bars": True})

Syncing Multiple Charts

from pydygraphs import sync_dygraphs, stacked_bar

chart_a = Dygraph(df1).range_selector().to_dash(app, component_id="a")
chart_b = Dygraph(df2).range_selector().to_dash(app, component_id="b")
chart_c = stacked_bar(app, "c", csv_data, title="Stacked Bar")

sync = sync_dygraphs(app, ["a", "b", "c"])
app.layout = html.Div([sync, chart_a, chart_b, chart_c])

Dynamic Updates (Dash)

Charts expose dcc.Store components:

Output("{id}-store", "data")    # update chart data
Output("{id}-opts", "data")     # update options at runtime
Input("{id}-xrange", "data")    # read current date window

Capture (dash-capture)

from pydygraphs import dygraph_strategy
from dash_capture import capture_element

capture_element(app, "btn", "chart-container", "img-store",
                strategy=dygraph_strategy(hide_range_selector=True))

API Reference

Builder Methods

Declarative Dataclasses

Options, Axis, Series, Legend, Highlight, Annotation, Shading, Event, Limit, RangeSelector, Roller, Callbacks

All accept the same parameters as their builder counterparts. Pass as dataclass or dict.

Plotters

.bar_chart(), .stacked_bar_chart(), .multi_column(), .candlestick(), .bar_series(name), .stem_series(name), .shadow(name), .filled_line(name), .error_fill(name) + group variants

Also via constructor: Dygraph(df, plotter="bar_chart")

Plugins

.unzoom(), .crosshair(direction), .ribbon(data, palette), .rebase(value, percent)

Development

uv sync --group dev
uv run ruff check src/ tests/
uv run ty check
uv run prek run --all-files
uv run pytest tests/pydygraphs/    # core tests
uv run pytest tests/dash/          # Dash adapter tests
uv run pytest tests/integration/   # Chrome integration tests

License

MIT