pip安装altair 

如果下载速度慢，可以使用教育网下载地址

pip install altair vega_datasets -i https://pypi.tuna.tsinghua.edu.cn/simple

import altair as alt
import pandas as pd
df = pd.read_csv('https://anvil.works/blog/img/plotting-in-python/uk-election-results.csv')
df

brush = alt.selection_interval()
alt.Chart(df).mark_point().encode(
    x='year:Q',
    y='liberal:Q',
    color=alt.condition(brush, 'others:N', alt.value('lightgray'))
).add_selection(
    brush
)

alt.Chart(df).mark_bar().encode(
    y='others:N',
    color='year:N',
    x='count(labour):Q'
)