Altair水平或垂直连接Contact时分别设置标题并同时设置背景的方法

带有水平连接图表的两个标题

我想连接两个图表，然后美化生成的组合图表（添加一些漂亮的背景）。这里重要的一件事是尝试保留两个图表的标题。

当我尝试这样做时，我要么得到只有一个标题的美化组合图表，要么得到一个错误：ValueError: Objects with "background" attribute cannot be used within HConcatChart. Consider defining the background attribute in the HConcatChart object instead.

这是我尝试过的一些虚拟代码片段。

尝试#1，它只产生一个标题：

import altair as altfrom vega_datasets import data source = data.cars() line = alt.Chart(source).mark_line().encode(    x='Year',    y='mean(Miles_per_Gallon)') band = alt.Chart(source).mark_errorband(extent='ci').encode(    x='Year',    y=alt.Y('Miles_per_Gallon', title='Miles/Gallon'),) combined = band | linecombinedcombined.properties(background = '#f9f9f9',                    title = alt.TitleParams(text = 'General title',                                             subtitle = ['Subtitle'],                                            font = 'Ubuntu Mono',                                             fontSize = 22,                                             color = '#3E454F',                                             subtitleFont = 'Ubuntu Mono',                                            subtitleFontSize = 16,                                             subtitleColor = '#3E454F')                  )

尝试#2，它会产生一个值错误：

line2 = line.properties(background = '#f9f9f9',                    title = alt.TitleParams(text = 'General title 1',                                             subtitle = ['Subtitle'],                                            font = 'Ubuntu Mono',                                             fontSize = 22,                                             color = '#3E454F',                                             subtitleFont = 'Ubuntu Mono',                                            subtitleFontSize = 16,                                             subtitleColor = '#3E454F')                  ) band2 = band.properties(background = '#f9f9f9',                    title = alt.TitleParams(text = 'General title 2',                                             subtitle = ['Subtitle'],                                            font = 'Ubuntu Mono',                                             fontSize = 22,                                             color = '#3E454F',                                             subtitleFont = 'Ubuntu Mono',                                            subtitleFontSize = 16,                                             subtitleColor = '#3E454F')                  )line2 | band2

有没有办法实现我想要的？或者 Altair 还不允许这样做？

    解决办法：
   

    您可以在单个图表上指定标题，在组合图表上指定背景
   

line2 = line.properties(
                    title = alt.TitleParams(text = 'General title 1', 
                                            subtitle = ['Subtitle'],
                                            font = 'Ubuntu Mono', 
                                            fontSize = 22, 
                                            color = '#3E454F', 
                                            subtitleFont = 'Ubuntu Mono',
                                            subtitleFontSize = 16, 
                                            subtitleColor = '#3E454F')
                  )

band2 = band.properties(
                    title = alt.TitleParams(text = 'General title 2', 
                                            subtitle = ['Subtitle'],
                                            font = 'Ubuntu Mono', 
                                            fontSize = 22, 
                                            color = '#3E454F', 
                                            subtitleFont = 'Ubuntu Mono',
                                            subtitleFontSize = 16, 
                                            subtitleColor = '#3E454F')
                  )

combined = band2 | line2
combined.properties(background = '#f9f9f9')

https://stackoverflow.com/questions/65647305/two-titles-with-horizontally-concatenated-chartshttps://stackoverflow.com/questions/65647305/two-titles-with-horizontally-concatenated-charts

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