Declarative visualization library for Python

altair

强大的数据可视化 Python 库。支持多种数据展示方式、接口简单、效果炫酷，示例代码和效果如下：
```python
import altair as alt
from vega_datasets import data

source = data.cars()
brush = alt.selection(type='interval')
points = alt.Chart(source).mark_point().encode(
    x='Horsepower',
    y='Miles_per_Gallon',
    color=alt.condition(brush, 'Origin', alt.value('lightgray'))
).add_selection(
    brush
)

bars = alt.Chart(source).mark_bar().encode(
    y='Origin',
    color='Origin',
    x='count(Origin)'
).transform_filter(
    brush
)

points & bars
```


Date	Star	Daily change
周日	10,512	—
周一	10,513	+1
周二	10,514	+1
周三	10,513	-1
周四	10,514	+1
周五	10,515	+1

vega/altair

vega/altair

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