plotly.express.scattermatrix displays no color if supplied a pandas.DataFrame with a DataTime index

[Noskario]

The color does not get diplayed when using a DataFrame with a DateTime index.

Have a look at the following example:

import pandas as pd
import plotly.express as px
df = pd.DataFrame({
        "x":[1,2,3,4],
        "y":[10,20,10,20],
        "z":[-1,-2,-3,-4],
        "color":[1,2,3,4]
    })
df.index = pd.DatetimeIndex(["1/1/2020 10:00:00+00:00", "2/1/2020 11:00:00+00:00", "3/1/2020 10:00:00+00:00", "4/1/2020 11:00:00+00:00"])
px.scatter_matrix(df, color = "color")

There are no problems when you comment out the line df.index = ....

Maybe this issue is related to #4788

[MarcoGorelli]

Hi @Noskario

is this your expected output?

if so, I might have a fix

[Noskario]

Yes, absolutely!

[MarcoGorelli]

cool, thanks! if you try

pip install -U --pre plotly narwhals

then you'll get to try out the Plotly 6.0 prerelease, which should have this fixed - if you then find and report any other issues so they can be fixed ahead of the final 6.0 release then you're a star ⭐