使用Matplotlib添加堆叠条形图标签

import matplotlib.pyplot as plt
import numpy as np

categories = ['A', 'B', 'C', 'D']  # 类别
data1 = [10, 15, 20, 25]  # 数据1
data2 = [5, 10, 15, 20]  # 数据2
data3 = [3, 6, 9, 12]  # 数据3

fig, ax = plt.subplots()

# 绘制堆叠条形图
ax.bar(categories, data1, label='Data 1')
ax.bar(categories, data2, bottom=data1, label='Data 2')
ax.bar(categories, data3, bottom=np.add(data1, data2), label='Data 3')

# 添加图例
ax.legend()

# 添加标签
for i, category in enumerate(categories):
    total = data1[i] + data2[i] + data3[i]
    ax.text(category, total, str(total), ha='center', va='bottom')

# 显示图表
plt.show()