Plotly legend title

Question

I\'d like to be able to add a title to the legend, in the following code. However, looking at the docs, I don\'t think there is a method for this.

import plo         


        

Answer 1

I've done this before by making a data-less trace

import plotly.plotly as py
import plotly.graph_objs as go

dummy_trace = go.Scatter(
    x=[None], y=[None],
    name='Legend Heading',
    # set opacity = 0
    line={'color': 'rgba(0, 0, 0, 0)'}
)

trace0 = go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[1, 2, 3, 4, 5],
)

trace1 = go.Scatter(
    x=[1, 2, 3, 4, 5],
    y=[5, 4, 3, 2, 1],
)

data = [dummy_trace, trace0, trace1]
fig = go.Figure(data=data)

py.iplot(fig)