How can I group legends in Plotly charts?

How can I group legends in Plotly charts?

You can group legends in Plotly by using the legendgroup attribute in your trace definitions. This allows you to specify which traces belong to the same legend group.

Can you show me an example of how to implement that?

Sure! Here's a simple example:

import plotly.graph_objects as go

fig = go.Figure()

fig.add_trace(go.Scatter(x=[1, 2, 3], y=[4, 5, 6], mode='lines', name='Group 1', legendgroup='group1'))
fig.add_trace(go.Scatter(x=[1, 2, 3], y=[6, 5, 4], mode='lines', name='Group 2', legendgroup='group1'))

fig.show()

This will group the two traces under the same legend entry.

What if I want to customize the legend appearance?

You can customize the legend appearance using the layout property. For example, you can change the font size, color, and position of the legend.

Can you provide a code snippet for customizing the legend?

Absolutely! Here's how you can customize the legend:

fig.update_layout(legend=dict(font=dict(size=14, color='blue'), orientation='h'))

This will set the legend font size to 14 and color to blue, and arrange the legend items horizontally.