通过Altair生成两个图例

import altair as alt
from vega_datasets import data

# 加载数据集
cars = data.cars()

# 创建散点图
scatter_plot = alt.Chart(cars).mark_circle().encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color='Origin',
    size='Cylinders',
    tooltip=['Name', 'Horsepower', 'Miles_per_Gallon']
).properties(
    width=500,
    height=300
)

# 创建柱状图
bar_chart = alt.Chart(cars).mark_bar().encode(
    x='Origin',
    y='count()',
    color='Origin',
    tooltip='count()'
).properties(
    width=500,
    height=300
)

# 生成两个图例
legend1 = scatter_plot.encode(color=alt.Color('Origin', legend=alt.Legend(title='汽车产地')))
legend2 = bar_chart.encode(color=alt.Color('Origin', legend=alt.Legend(title='汽车产地')))

# 显示图表
legend1 | legend2