import altair as alt
from altair_recipes.display_pweave import show
import pandas as pd
import numpy as np

Sample data (must sum to 100):

energy = pd.DataFrame(
    {
        "source": ["natural gas", "nuclear", "coal", "hydro"],
        "percentage": [50, 30, 10, 10],
        "renewable": [False, False, False, True],
    }
)

Define viz:

def mybarchart(data, source):
    return (
        alt.Chart(data=data)
        .mark_bar()
        .encode(x=source, y="percentage", color="renewable")
    )

Charts related by color:

show(mybarchart(energy, source="source"))

show(
    mybarchart(
        energy.groupby(by="renewable").agg({"percentage": "sum", "renewable": "first"}),
        source="renewable",
    )
)