如何在Python中从带有百分比值的数据帧中创建堆叠的百分比条形图？

import pandas as pd
import matplotlib.pyplot as plt

# 创建一个示例数据帧
data = {'Category': ['A', 'B', 'C', 'D'],
        'Value1': [20, 30, 40, 50],
        'Value2': [30, 10, 20, 40],
        'Value3': [50, 60, 40, 10]}
df = pd.DataFrame(data)

# 计算每个类别的百分比
df['Total'] = df.sum(axis=1)
df['Value1_Percentage'] = df['Value1'] / df['Total']
df['Value2_Percentage'] = df['Value2'] / df['Total']
df['Value3_Percentage'] = df['Value3'] / df['Total']

# 创建堆叠的百分比条形图
fig, ax = plt.subplots()
ax.bar(df['Category'], df['Value1_Percentage'], label='Value1')
ax.bar(df['Category'], df['Value2_Percentage'], bottom=df['Value1_Percentage'], label='Value2')
ax.bar(df['Category'], df['Value3_Percentage'], bottom=df['Value1_Percentage']+df['Value2_Percentage'], label='Value3')

ax.set_ylabel('Percentage')
ax.set_xlabel('Category')
ax.set_title('Stacked Percentage Bar Chart')

ax.legend()
plt.show()