Line Chart with Logarithmic Scale

How to make a line chart on a Logarithmic scale.

Method syntax

import altair as alt
from vega_datasets import data

source = data.population()

alt.Chart(source).mark_line().encode(
    x='year:O',
    y=alt.Y('sum(people)').scale(type="log")
)

Attribute syntax

import altair as alt
from vega_datasets import data

source = data.population()

alt.Chart(source).mark_line().encode(
    x='year:O',
    y=alt.Y(
        'sum(people)',
        scale=alt.Scale(type="log")  # Here the scale is applied
    )
)