如何使用Bokeh色彩映射处理shapefile中的重叠

import geopandas as gpd
from bokeh.plotting import figure, show
from bokeh.models import LinearColorMapper, ColorBar
from bokeh.palettes import Viridis256

shapefile = gpd.read_file('path/to/shapefile.shp')

p = figure(title='Shapefile Overlapping', plot_width=800, plot_height=600)

color_mapper = LinearColorMapper(palette=Viridis256, low=shapefile['value'].min(), high=shapefile['value'].max())

p.patches(xs=shapefile['geometry'].apply(lambda x: x.exterior.coords.xy[0]),
          ys=shapefile['geometry'].apply(lambda x: x.exterior.coords.xy[1]),
          fill_color={'field': 'value', 'transform': color_mapper},
          line_color='black')

color_bar = ColorBar(color_mapper=color_mapper, label_standoff=12)
p.add_layout(color_bar, 'right')

show(p)