如何使用python-docx更改标题的样式？

from docx import Document
from docx.enum.text import WD_PARAGRAPH_ALIGNMENT
from docx.shared import Pt

def change_title_style(docx_file, title_text, font_size, alignment):
    doc = Document(docx_file)
    
    # 遍历文档中的段落
    for paragraph in doc.paragraphs:
        # 判断段落是否为标题
        if paragraph.style.name.startswith('Heading'):
            # 判断标题文本是否匹配
            if paragraph.text == title_text:
                # 修改标题样式
                paragraph.style.font.size = Pt(font_size)
                paragraph.alignment = alignment
    
    # 保存修改后的文档
    doc.save('modified.docx')

# 使用示例
change_title_style('example.docx', '标题一', 14, WD_PARAGRAPH_ALIGNMENT.CENTER)