Plot.ly pie chart result precision

Question

How do I set precision to 1 decimal point when generating simple pie charts using plot.ly python lib?

Here's a sample code:

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

question = {
    'A': 3,
    'B': 7,
    'C': 6,
    'D': 11,
    'E': 6
}

trace = go.Pie(labels=list(question.keys()), values=list(question.values()))
py.image.save_as([trace], filename='output.png')

That creates the following chart:

As you can see on the image, value for "A" is computed as 9.09%, thus if we sum up all the chart percentage we're left with 99,99%.

Is there a param for the plot.ly api to make them round up the "A" value to 9.1%, so that each chart percentage value would use 1 decimal point precision (and sum to 100%)?

Answer 1

Like this?

import plotly.express as px
import pandas as pd


df = pd.DataFrame(data=[['A',3],['B',7], ['C',6], ['D',11], ['E',6]], columns=['letter','value'])

fig = px.pie(df,  names='letter', values='value')
fig.update_traces(texttemplate='%{percent:.1%f}')
fig.show()

This produces: