Format all markers in Plotly with Python

Question

I just started using plotly and I'm trying to format markers on my plotly pie chart based on the example here. When I do so, it only changes the marker formatting for one of the markers, not for all of them. This appears to be the case in the example on the plotly website as well. If you follow the link and look at the Styled Pie Chart, only Hydrogen has the white font, while all others have black font.

How can I make all of the markers have the same text formatting?

My code:

trace = go.Pie(labels=labels, values=values, hoverinfo='label+value', textinfo='percent', 
           textfont=dict(size=20, color='#ffffff'),
           marker=dict(line=dict(color='#ffffff', width=2)))

Any help on how I can apply it to all markers would be greatly appreciated.

Maximilian Peters · Accepted Answer · 2017-07-22 23:17:27Z

If you want to change the format of hover info/hover label of a Pie chart in Plotly you would need to set the hoverlabel parameters.

import plotly
plotly.offline.init_notebook_mode()
labels = ['Oxygen', 'Hydrogen', 'Carbon_Dioxide', 'Nitrogen']
values = [4500, 2500, 1053, 500]

trace = plotly.graph_objs.Pie(labels=labels, 
                              values=values,
                              textfont=dict(size=20),
                              hoverlabel=dict(bgcolor='black', 
                                              font=dict(color='white')
                                             )
                             )
plotly.offline.iplot([trace])

The snippet above would give hover labels with black background and a white font.

In your code textfont and marker specify the format of the labels inside the pie chart, not the hover labels. Plotly picks the colors for you if you don't specify them, it's just an accident that they match your color setting sometimes.

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