Python:如何更新bokeh patches字段？

from bokeh.plotting import figure, show
from bokeh.models import ColumnDataSource, Patch

# 创建初始的多边形数据
polygon_data = [[(1, 1), (2, 1), (2, 2)],  # 多边形1
                [(3, 3), (4, 3), (4, 4)]]  # 多边形2

source = ColumnDataSource(data=dict(patches=[Patch(xs=coords[:, 0], ys=coords[:, 1]) for coords in polygon_data]))

# 获取patches字段的数据源
patches_data = source.data['patches']

# 更新多边形数据
new_polygon_data = [[(1, 1), (2, 1), (2, 2)],  # 更新后的多边形1
                    [(3, 3), (4, 3), (4, 4)],  # 更新后的多边形2
                    [(5, 5), (6, 5), (6, 6)]]  # 新增的多边形

patches_data['xs'] = [coords[:, 0] for coords in new_polygon_data]
patches_data['ys'] = [coords[:, 1] for coords in new_polygon_data]

# 将修改后的数据源赋值回patches字段
source.data['patches'] = patches_data

# 创建绘图对象
p = figure()

# 绘制多边形
p.patches('xs', 'ys', source=source.data['patches'])

# 展示图形
show(p)