[Python] How to display Polars list columns in NiceGUI

I’m migrating from Streamlit to NiceGUI and noticed a difference in how DataFrames with list columns are handled.

With Streamlit:

import polars as pl
import streamlit as st

df = pl.DataFrame({
"a": [1, 2, 3],
"b": [4, 5, 6],
"c": [[1, 2], [3, 4], [5, 6]],
})

st.write(df)


Column c is shown as a list: [1, 2], [3, 4], [5, 6].

With NiceGUI:

import polars as pl
from nicegui import ui

df = pl.DataFrame({
"a": [1, 2, 3],
"b": [4, 5, 6],
"c": [[1, 2], [3, 4], [5, 6]],
})

ui.table.from_polars(df)
ui.run()


Column c gets concatenated into a string instead of being displayed as a list.

So ,i’m looking for is a way to achieve a result similar to what I get with my Streamlit script.

PD: The transformation using the method from_polars() make the program really slow.

Continue reading...