显示Matplotlib中2个变量的百分比值的堆叠条形图？

import matplotlib.pyplot as plt
import numpy as np

categories = ['Category 1', 'Category 2', 'Category 3']  # 类别
variable1 = [20, 30, 40]  # 变量1的值
variable2 = [10, 25, 35]  # 变量2的值

total = np.add(variable1, variable2)  # 计算总和
variable1_percentage = np.divide(variable1, total) * 100  # 计算变量1的百分比值
variable2_percentage = np.divide(variable2, total) * 100  # 计算变量2的百分比值

plt.bar(categories, variable1_percentage, label='Variable 1')
plt.bar(categories, variable2_percentage, bottom=variable1_percentage, label='Variable 2')
plt.xlabel('Categories')
plt.ylabel('Percentage')
plt.title('Stacked Bar Chart with Percentage Values')
plt.legend()
plt.show()