Plotly:对图例中的轨迹进行分组并移除水平标签

import plotly.graph_objects as go

# 创建轨迹1
trace1 = go.Scatter(
    x=[1, 2, 3],
    y=[4, 5, 6],
    name='Trace 1',
    legendgroup='Group1'
)

# 创建轨迹2
trace2 = go.Scatter(
    x=[1, 2, 3],
    y=[7, 8, 9],
    name='Trace 2',
    legendgroup='Group1'
)

# 创建轨迹3
trace3 = go.Scatter(
    x=[1, 2, 3],
    y=[10, 11, 12],
    name='Trace 3',
    legendgroup='Group2'
)

# 创建图表布局
layout = go.Layout(
    legend=dict(
        orientation='v'  # 设置图例标签垂直显示
    )
)

# 创建图表对象
fig = go.Figure(data=[trace1, trace2, trace3], layout=layout)

# 显示图表
fig.show()