python - 在 plotly 中自定义图例的顺序

Question

我正在尝试在 plotly,python 中绘制堆叠条形图时自定义图例的顺序。

data = [
        go.Bar(
            y=df['sid'],  # assign x as the dataframe column 'x'
            x=df['A'],
            orientation='h',
            name='A'
        ),
        go.Bar(
            y=df['sid'],
            x=df['B'],
            orientation='h',
            name='B'
        ),

    ]

    layout = go.Layout(
        barmode='stack',
        title=f'{measurement}',
        xaxis=dict(
            title='Count',
            dtick=0),
        yaxis=dict(
            tickfont=dict(
                size=10,
            ),
            dtick=1)
    )

    fig = go.Figure(data=data, layout=layout)
    plot(fig, filename='plot.html')

图例的顺序以相反的顺序出现(即从下到上)。我想改变data中相应项目从上到下的顺序。

我看到了建议的选项 here对于 Java。不确定如何在 python 中实现。

有人可以建议如何颠倒顺序吗？

编辑:在生成的图像中，图例的顺序是

B
A

所需顺序:

A
B

Answer 1

您可以使用 traceorder图例键:

Determines the order at which the legend items are displayed. If "normal", the items are displayed top-to-bottom in the same order as the input data. If "reversed", the items are displayed in the opposite order as "normal". If "grouped", the items are displayed in groups (when a trace legendgroup is provided). if "grouped+reversed", the items are displayed in the opposite order as "grouped".

在你的情况下，你应该修改你的 layout 定义:

layout = go.Layout(
    barmode='stack',
    title=f'{measurement}',
    xaxis=dict(
        title='Count',
        dtick=0),
    yaxis=dict(
        tickfont=dict(
            size=10,
        ),
        dtick=1),
   legend={'traceorder':'normal'})
)

---

没有traceorder规范

import plotly.graph_objs as go
from plotly.offline import init_notebook_mode, iplot
init_notebook_mode(connected=True)

trace1 = go.Bar(x=['A', 'B', 'C'],
                y=[20, 14, 23],
                name='first')
trace2 = go.Bar(x=['A', 'B', 'C'],
                y=[12, 18, 29],
                name='second')

data = [trace1, trace2]
layout = go.Layout(barmode='stack',)

fig = go.Figure(data=data, layout=layout)
iplot(fig, filename='stacked-bar')

具有跟踪顺序规范

import plotly.graph_objs as go
from plotly.offline import init_notebook_mode, iplot
init_notebook_mode(connected=True)

trace1 = go.Bar(x=['A', 'B', 'C'],
                y=[20, 14, 23],
                name='first')
trace2 = go.Bar(x=['A', 'B', 'C'],
                y=[12, 18, 29],
                name='second')

data = [trace1, trace2]
layout = go.Layout(barmode='stack',
                   legend={'traceorder':'normal'})

fig = go.Figure(data=data, layout=layout)
iplot(fig, filename='stacked-bar')