Python：如何更新bokeh补丁字段？

我正在使用

bokeh

，我想更新补丁的

字段

值

首先，我将一个geodataframe

gdf

转换为一个

GeoJSONDataSource

from bokeh.models import LogColorMapper
from bokeh.palettes import Viridis256 as palette
from bokeh.models.glyphs import Patch
from bokeh.models import GeoJSONDataSource, Select

geo_gdf   = GeoJSONDataSource(geojson=gdf.to_json())

w = 200
h = 200
field = 'col1' ## choose col1 as field to plot
vmin = min(gdf[field])
vmax = max(gdf[field])
## create plot
p = figure(plot_width=w,plot_height=h)
color_mapper = LogColorMapper(palette=palette, low=vmin, high=vmax)

## Patches definition  
grid=p.patches('xs', 'ys', source = geo_source2, name="grid",
          fill_color={'field': field, 'transform': color_mapper},
          fill_alpha=0.5,  line_color="gray", line_width=2)

我想通过选择一个选项来更改

字段

select =  Select(title="Options",  options = ['Col1', 'Col2'], value = 'Col1')

def update_plot(attrname, old, new):
    option   = select.value
    if option == 'Col1':
        p.field = 'Col1'
    if option == 'Col2':
        p.field = 'Col2'

select.on_change('value', update_plot) 
curdoc().add_root(select)

---

字段

不是glyph的属性，它是关于如何处理特定属性（例如

填充颜色

）的规范。您需要以与设置相同的方式进行更新：

grid.glyph.fill_color = {'field': option, 'transform': color_mapper}