Dollar cents axis in Altair

Question

I would like to format the axis in the following plot such that it shows dollar cents instead of fractional dollars.

data = pd.DataFrame({
    'x': np.random.rand(20)
})

alt.Chart(data).mark_tick().encode(
    alt.X('x', axis=alt.Axis(format='$.2f'))
)

Answer 1

You can use labelExpr to add arbitrary characters to the axis labels:

data = pd.DataFrame({
    'x': np.random.rand(20)
})

alt.Chart(data).mark_tick().encode(
    alt.X('x', axis=alt.Axis(labelExpr='datum.value + "p"'))
)