[英]Is there a way to format tooltip values in Altair boxplot
Is is possible to format the values within a tooltip for a boxplot?是否可以在箱线图的工具提示中格式化值? From this Vega documentation , it appears so, but I can't quite figure out how to do it with Altair for python
从this Vega documentation看来是这样,但我不太清楚如何使用Altair for python
from vega_datasets import data
import altair as alt
source = data.population.url
alt.Chart(source).mark_boxplot().encode(
alt.X("age:O"),
alt.Y("people:Q"),
tooltip=[
alt.Tooltip("people:Q", format=",.2f"),
],
)
I believe you need to provide an aggregation for composite marks like mark_boxplot
.我相信您需要为诸如
mark_boxplot
类的复合标记提供聚合。 This works:这有效:
from vega_datasets import data
import altair as alt
source = data.population.url
alt.Chart(source).mark_boxplot().encode(
alt.X("age:O"),
alt.Y("people:Q"),
tooltip=alt.Tooltip("mean(people):Q", format=",.2f"),)
There is a way to add multiple columns to the tooltip.有一种方法可以将多列添加到工具提示中。 You can pass in multiple columns in square brackets as a list.
您可以将方括号中的多列作为列表传递。
import altair as alt
from vega_datasets import data
stocks = data.stocks()
alt.Chart(stocks).mark_point().transform_window(
previous_price = 'lag(price)'
).transform_calculate(
pct_change = '(datum.price - datum.previous_price) / datum.previous_price'
).encode(
x='date',
y='price',
color='symbol',
tooltip=[ 'price', 'symbol', alt.Tooltip('pct_change:Q', format='.1%')]
)
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