plotly / plotly/plotly.py

customdata parsed incorrectly when array contains more than 1 column in piechart

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bug P2
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Python
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描述

When using more than one column to define customdata, the data seems to be parsed as a tuple.
The example below shows three versions of the same figure:

  • LEFT. Only one column of customdata. Works as expected.
  • CENTER. Two columns of customdata. The first column in customdata is not parsed correctly when using a :.1s format. The second column in customdata is not parsed correctly by hovertemplate in go.Pie but is parsed correctly by texttemplate.
  • RIGHT. Workaround using customdata as a tuple and selecting its first %{customdata[0][0]} and second %{customdata[0][1]} values accordingly.
import pandas as pd
import plotly.graph_objects as go
from plotly.subplots import make_subplots

df = pd.DataFrame({
    'country': ['A', 'B', 'C'],
    'count':   [10, 20, 30],
    'total': [1.5e5, 4.5e4, 3.2e3],
    'ratio': [0.05, 0.10, 0.15]
})

fig = make_subplots(rows=1, cols=3, specs=[[{"type": "domain"}, {"type": "domain"}, {"type": "domain"}]])

# customdata parsed correctly with only one column
fig.add_trace(go.Pie(
    labels=df['country'],
    values=df['count'],
    customdata=df[['total']], # 1 column
    hovertemplate=(
        'Country: %{label}<br>'
        'Count: %{value}<br>'
        'Total documents: %{customdata[0]:.1s}'),
    hole=0.3
),
row=1, col=1)

# Problem with customdata
fig.add_trace(go.Pie(
    labels=df['country'],
    values=df['count'],
    customdata=df[['total', 'ratio']], # >1 columns
    hovertemplate=(
        'Country: %{label}<br>'
        'Count: %{value}<br>'
        'Total documents: %{customdata[0]:.1s}<br>'
        'Ratio: %{customdata[1]:.2f}'),
    texttemplate = "%{customdata[1]:.2p}", # correctly parsed
    hole=0.3
),
row=1, col=2)

# Workaround
fig.add_trace(go.Pie(
    labels=df['country'],
    values=df['count'],
    customdata=df[['total', 'ratio']], # >1 columns
    hovertemplate=(
        'Country: %{label}<br>'
        'Count: %{value}<br>'
        'Total documents: %{customdata[0][0]:.1s}<br>' # as tuple
        'Ratio: %{customdata[0][1]:.2f}'),
    texttemplate = "%{customdata[1]:.2p}",  # correctly parsed
    hole=0.3
),
row=1, col=3)

fig.show()

Tested using:
Plotly.py: 6.0.1
Pandas: 2.1.4

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  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

先运行提供的 Plotly.py 和 Pandas 复现代码,然后跟踪多列 customdata 如何传递给 pie-chart 的 hovertemplate 格式化。完成标准是:两个 customdata 列都能以请求的格式进行渲染,且不使用 tuple-style indexing,同时单列情况和 texttemplate 的行为保持正确。

由索引模型根据 Issue 内容生成。

评估

技术栈
pandas, python
领域
data-visualization
Issue 类型
缺陷
难度
3/5
预计耗时
1-2 天
活跃度
停滞
描述清晰度
基本清楚
新手友好度
45/100

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