如何在从pandas Dataframe呈现的HTML表中实现rowspan？

import pandas as pd

# 创建DataFrame对象
data = {'A': ['A1', 'A2', 'A3'],
        'B': ['B1', 'B2', 'B3'],
        'C': ['C1', 'C2', 'C3'],
        'D': ['D1', 'D2', 'D3']}
df = pd.DataFrame(data)

# 将DataFrame转换为Styler对象
styled_df = df.style

def apply_rowspan(row):
    if row.name == 0:
        return ['<td rowspan="3">{}</td>'.format(row['A']),
                '<td rowspan="3">{}</td>'.format(row['B']),
                '<td>{}</td>'.format(row['C']),
                '<td>{}</td>'.format(row['D'])]
    else:
        return ['<td>{}</td>'.format(row['C']),
                '<td>{}</td>'.format(row['D'])]

# 应用自定义函数
styled_df = styled_df.apply(apply_rowspan, axis=1)

# 设置表格样式
table_styles = [{'selector': 'td',
                 'props': [('border', '1px solid black')]},
                {'selector': 'th',
                 'props': [('border', '1px solid black')]},
                {'selector': 'table',
                 'props': [('border-collapse', 'collapse')]}]

styled_df = styled_df.set_table_styles(table_styles)

# 将Styler对象转换为HTML表格
html_table = styled_df.render()

# 在Jupyter Notebook中显示HTML表格
from IPython.display import display, HTML
display(HTML(html_table))

# 或保存为HTML文件
with open('styled_table.html', 'w') as f:
    f.write(html_table)