[Python] Altair graph with conditional tooltip

I want to use 'tooltip' to show information depending on the type of point in the plot. I noticed that 'tooltip' accepts 'condition'. Therefore, I'm trying to use 'tooltip' together with 'alt.condition', but without success. Below is my attempt:

import altair as alt
from vega_datasets import data

source = data.cars()

chart = alt.Chart(source).mark_circle(size=60).encode(
x='Horsepower',
y='Miles_per_Gallon',
color='Origin',
tooltip=alt.condition(
alt.datum.Origin == 'EUA',
['Name', 'Horsepower'],
['Name', 'Miles_per_Gallon']
)
)

chart.save('tooltip.html')


Is there any solution for this?

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