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When there are duplicate values in a bar graph in Plotly, the default behavior is to aggregate the values and display a single bar for each unique value. However, if you want to display multiple bars for each duplicate value, you can use the barmode parameter in the layout object.
The barmode parameter can be set to stack, group, or overlay depending on how you want to display the bars.
Here's an example of how to set the barmode parameter to group to display multiple bars for each duplicate value:
import plotly.graph_objs as go
x = ['A', 'A', 'B', 'B', 'C', 'C']
y = [1, 2, 3, 4, 5, 6]
fig = go.Figure(data=[go.Bar(x=x, y=y)], layout=go.Layout(barmode='group'))
fig.show()
In this example, the x values are duplicated, but the barmode parameter is set to group, which displays separate bars for each value.
You can experiment with the barmode parameter to determine the best display options for your data.