qcharts 1.3.0

The Lightweight Charts Jupyter extension

QCharts

A Jupyter stock charting extension built on TradingView Lightweight Charts. Create interactive candlestick charts, technical indicators, and volume charts in Jupyter Notebook via a Python API.

中文文档

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Features

• 6 Chart Types — Candlestick, Line, Area, Bar, Baseline, Histogram
• Multi-Pane Support — Stack multiple panels in a single chart (main chart + volume + MACD + KDJ, etc.)
• Built-in Technical Indicators — plot_ma() Moving Averages, plot_macd() MACD, plot_kdj() KDJ
• Batch Lines — plot_lines() draws multiple lines at once via a column list or column→style mapping
• Rectangle Bands — plot_rectangle() draws horizontal price bands for support/resistance or ranges
• Volume — Auto-colored by up/down, compressed at the bottom of the candlestick pane
• Trade Markers — Annotate buy/sell signals on the chart via set_markers()
• Interactive Legend — Real-time OHLC, price change %, and volume on crosshair hover
• Responsive Sizing — Fixed dimensions or auto-fill container
• Multiple Display Modes — Embedded Jupyter widget, IPython rich output, or browser for scripts

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Installation

pip install qcharts
# or with uv
uv add qcharts

Dependencies:

• Python >= 3.12
• anywidget >= 0.11.0
• pandas >= 3.0.3
• JupyterLab >= 4.5 (for widget display)

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Quick Start

import pandas as pd
from qcharts import Chart

# Load stock data
df = pd.read_csv("stock.csv", parse_dates=["date"])

# Create chart and set data
chart = Chart(height=400)
chart.plot_stock(df, "603629")
chart  # Display in Jupyter (widget)

In a plain script (no Jupyter kernel), use show() to open a self-contained HTML in the browser:

chart.show()

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Usage Guide

1. Basic Candlestick + Volume

plot_stock() creates candlestick and volume in one step, setting the pane label to the stock code:

chart = Chart(height=400)
chart.plot_stock(df, "603629")
chart

Or build step by step:

chart = Chart(height=400)
chart.plot_candles(df)                  # Candlestick
chart.plot_volume(df, pane_name="vol")  # Volume (separate pane)
chart

DataFrame requirements: Must contain a datetime (or date) column plus open, high, low, close columns; volume also requires a volume column. The datetime/date column may also be supplied as the DataFrame index.

2. Moving Averages

plot_ma() auto-detects columns matching prefix + number:

df_ma = df[["date", "close"]].copy()
df_ma["ma5"] = df_ma["close"].rolling(5).mean()
df_ma["ma10"] = df_ma["close"].rolling(10).mean()
df_ma["ma20"] = df_ma["close"].rolling(20).mean()

chart.plot_ma(df_ma, prefix="ma")

Custom colors:

chart.plot_ma(df_ma, prefix="ma", colors=["#2962FF", "#FF6D00", "#7B1FA2"])

3. MACD Indicator

plot_macd() creates MACD line, signal line, and histogram (with 4-color auto styling):

ema12 = df["close"].ewm(span=12, adjust=False).mean()
ema26 = df["close"].ewm(span=26, adjust=False).mean()

df_macd = df[["date"]].copy()
df_macd["macd"] = ema12 - ema26
df_macd["signal"] = df_macd["macd"].ewm(span=9, adjust=False).mean()
df_macd["hist"] = df_macd["macd"] - df_macd["signal"]

chart.plot_macd(df_macd)

DataFrame requirements: Must contain datetime (or date), macd, signal, hist columns.

4. KDJ Indicator

chart.plot_kdj(df_kdj)

DataFrame requirements: Must contain datetime (or date), k, d, j columns.

5. Batch Lines

plot_lines() draws multiple lines at once, accepting a column list or a column → style mapping:

# Column list: colors cycle through the default palette
chart.plot_lines(df, ["close", "ma5", "ma10"])

# Mapping: value is a color string, or a full config dict passed to add_line
chart.plot_lines(df, {
    "close": "#2962FF",
    "ma20": {"color": "#FF6D00", "line_width": 2},
})

6. Rectangle Bands

plot_rectangle() draws a horizontal price band, useful for marking support/resistance or ranges:

chart.plot_rectangle(
    t1="2024-01-01", t2="2024-03-01",
    high=10.5, low=9.5,
    color="#2962FF", alpha=0.2,
)

alpha controls the fill transparency; color sets the top/bottom edge lines.

7. Trade Signal Markers

markers = [
    {"time": 1704067200, "position": "belowBar", "shape": "arrowUp",
     "color": "#26a69a", "text": "Buy"},
    {"time": 1704153600, "position": "aboveBar", "shape": "arrowDown",
     "color": "#ef5350", "text": "Sell"},
]

# Get candlestick series and set markers
candle = chart.series["default_candlestick"]
candle.set_markers(markers)

Supported position: aboveBar, belowBar, inBar. Supported shape: arrowUp, arrowDown, circle, square, etc.

8. Multi-Pane Management

All series go into the main pane by default. Technical indicators (MACD, KDJ) auto-create new panes. You can also manage panes manually:

chart.add_pane("volume", label="Volume", height=20)
chart.plot_volume(df, pane_name="volume")

chart.add_pane("rsi", label="RSI", height=15)
chart.add_line("rsi", pane_name="rsi", color="#7B1FA2")

height is a proportional weight (not pixels), controlling the relative height of each pane.

9. Chart Sizing

# Fixed size
chart = Chart(width=800, height=500)

# Auto-fill container
chart = Chart(auto_size=True)

# Resize dynamically
chart.set_size(width=1000, height=600)

10. Custom Styling

All add_* methods accept Lightweight Charts style options. Parameters support both snake_case and camelCase:

chart.add_line("ma20", color="#FF6D00", line_width=2, line_style=2)
chart.add_candlestick("kline", up_color="#ef5350", down_color="#26a69a",
                       border_visible=True)

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Data Format

All methods accept either a pandas.DataFrame or a pre-formatted list[dict].

DataFrame Format

Method	Required Columns
plot_stock / plot_candles	datetime (or date), open, high, low, close
plot_volume	datetime (or date), volume, close, open
plot_ma	datetime (or date), ma{N} columns (e.g. ma5, ma10)
plot_macd	datetime (or date), macd, signal, hist
plot_kdj	datetime (or date), k, d, j
plot_lines	datetime (or date), plus the columns specified in lines

The time column may be datetime or date, or supplied as the DataFrame index; dtypes datetime64[ns], datetime64[us], datetime64[ms] are auto-converted to Unix timestamps (seconds).

list[dict] Format

# Candlestick data
[{"time": 1704067200, "open": 10.0, "high": 10.5, "low": 9.8, "close": 10.3}]

# Line/Area data
[{"time": 1704067200, "value": 10.3}]

# Histogram data (per-bar color supported)
[{"time": 1704067200, "value": 12345, "color": "#ef535080"}]

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API Reference

Chart(width=0, height=300, auto_size=False)

Business-layer methods (plot_*):

Method	Description
plot_stock(data, code, pane_name=None, up_color, down_color)	One-step candlestick + volume, sets pane label to code
plot_candles(data, pane_name=None, up_color, down_color)	Set candlestick data
plot_volume(data, pane_name=None, up_color, down_color)	Set volume data (colored by up/down)
plot_lines(data, lines, pane_name=None)	Batch-draw lines (column list or column → style mapping)
plot_ma(data, pane_name=None, prefix='ma', colors=None)	Add moving averages
plot_macd(data, pane_name='macd', macd_color, signal_color)	Add MACD (line + signal + histogram)
plot_kdj(data, pane_name='kdj', k_color, d_color, j_color)	Add KDJ (K/D/J lines)
plot_rectangle(t1, t2, high, low, color, pane_name=None, alpha=0.2)	Draw a horizontal price band

Low-level series methods (add_*):

Method	Description
add_line(name, pane_name=None, color='#2962FF', **kwargs)	Add line series
add_area(name, pane_name=None, **kwargs)	Add area series
add_bar(name, pane_name=None, **kwargs)	Add bar series
add_baseline(name, pane_name=None, **kwargs)	Add baseline series
add_histogram(name, pane_name=None, **kwargs)	Add histogram series
add_candlestick(name, pane_name=None, **kwargs)	Add candlestick series (custom name)

Chart management:

Method	Description
add_pane(name, label=None, height=30)	Add a new pane
get_pane(name)	Get a pane object
set_size(width=0, height=300)	Resize the chart
show(open_browser=True)	Display: rich output in a kernel, otherwise open self-contained HTML in browser

Series Methods

Each add_* method returns a Series object with:

Method	Description
set_data(data)	Update series data
set_markers(markers)	Set trade markers

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Development

# Python environment
uv sync

# JS build
cd js
pnpm install
pnpm run build        # Build ESM bundle
pnpm run dev          # Watch mode

# Formatting
cd js
pnpm run format       # Prettier formatting

After modifying JS code, rebuild with pnpm run build and restart the Jupyter kernel to see changes.

License

MIT