Python Plotly format axis numbers as %

You can use ticksuffix in the layout options.

yaxis=dict(ticksuffix=".00%")

layout = go.Layout(                
                yaxis=dict(ticksuffix=".00%", tickangle=45, title='Percentage Change(%)')

https://plot.ly/python/reference/#layout-yaxis

You could set tickformat in the layout options.

import plotly.graph_objects as go

layout = go.Layout(yaxis=dict(tickformat=".2%"))