创建多级饼图，其中外圆是matplotlib中内圆的子集

import matplotlib.pyplot as plt
import numpy as np

# 外圆数据
outer_labels = ['A', 'B', 'C']
outer_sizes = [30, 40, 50]

# 内圆1数据
inner1_labels = ['D', 'E']
inner1_sizes = [20, 30]

# 内圆2数据
inner2_labels = ['F', 'G', 'H']
inner2_sizes = [10, 20, 30]

fig, ax = plt.subplots()

# 绘制外圆饼图
ax.pie(outer_sizes, labels=outer_labels, radius=1.2, autopct='%1.1f%%', startangle=90)

# 绘制内圆1饼图
ax.pie(inner1_sizes, radius=1, autopct='%1.1f%%', startangle=90)

# 绘制内圆2饼图
ax.pie(inner2_sizes, radius=0.8, autopct='%1.1f%%', startangle=90)

# 设置图表标题
ax.set_title('Multi-level Pie Chart')

# 显示图表
plt.show()