Explicitly set colours of the boxplot in ploltly

Question

I am using plotly express to plot boxplot as shown below:

px.box(data_frame=df, 
       y="price", 
       x="products",
       points="all")

However, the boxpots of the products shown up with the same colours. They are four products. I would like to colour each with a different colour, using an additional paramter color_discrete_sequence does not work.

Answer 1

I am using plotly.express.data.tips() as an example dataset and am creating a new column called mcolour to show how we can use an additional column for coloring. See below;

## packages
import plotly.express as px
import numpy as np
import pandas as pd

## example dataset:
df = px.data.tips()

## creating a new column with colors
df['mcolour'] = np.where(
     df['day'] == "Sun" , 
    '#636EFA', 
     np.where(
        df['day'] == 'Sat', '#EF553B', '#00CC96'
     )
)

## plot
fig = px.box(df, x="day", y="total_bill", color="mcolour")
fig = fig.update_layout(showlegend=False)
fig.show()

So, as you see, you can simply assign colors based on another column using color argument in plotly.express.box().