Pacman Chart

Chart made using mark_arc and constant values. This could also be made using alt.Chart(source).mark_arc(color = "gold", theta = (5/8)*np.pi, theta2 = (19/8)*np.pi,radius=100).

import numpy as np
import altair as alt

alt.Chart().mark_arc(color="gold").encode(
    theta=alt.datum((5 / 8) * np.pi, scale=None),
    theta2=alt.datum((19 / 8) * np.pi),
    radius=alt.datum(100, scale=None),
)