Plotly box plot: remove transparency

Question

Boxplots in plotly by default are semi-transparent, how can I turn this off please. This has been asked on plotly forums before, but I'm not quite sure how to implement the suggestion. Below is a simple box plot from plotly doc, if someone can please help me remove any transparency from this.

import plotly.graph_objects as go
import numpy as np
np.random.seed(1)

y0 = np.random.randn(50) - 1
y1 = np.random.randn(50) + 1

fig = go.Figure()
fig.add_trace(go.Box(y=y0))
fig.add_trace(go.Box(y=y1))

fig.show()

Answer 1

The easiest way is to assign the fillcolor manually for each trace, which can be done by loading a color palette from plotly or plotly.express (see Color Sequences in Plotly), for example using the D3 palette :

np.random.seed(1)

y0 = np.random.randn(50) - 1
y1 = np.random.randn(50) + 1

colors = plotly.colors.qualitative.D3

fig = go.Figure(data=[
    go.Box(y=y0, fillcolor=colors[0]),
    go.Box(y=y1, fillcolor=colors[1])
])

fig.show()