如何优化Python生成HTML邮件正文的条件内容追加方式？

需求背景 #

我是HTML开发新手，目前用Python生成邮件正文，需求是勾选应用里的复选框时，在邮件内添加对应分类内容。原实现是预先设置多个display:none的隐藏段落，通过if条件替换对应内容，现在希望优化逻辑，无需依赖隐藏段落，直接在条件判断中追加内容。

优化后的代码 #

def update_body_mail_email():
    # 基础邮件模板，移除所有隐藏段落
    base_body = '''<html>
                        <head>
                            <meta charset="UTF-8">
                            <title>Your Email Title</title>
                            </head>
                            <body>
                            <table align="center" border="0" cellpadding="0" cellspacing="0" width="600">
                             <tr>
                               <td width="510" style="width:382.75pt;background:#0076CE;padding:0cm 5.4pt 0cm 5.4pt;
                                height:69.55pt">
                                <p class="MsoNormal"><a name="_MailAutoSig"><span style="font-size:15.0pt;
                                font-family:&quot;Arial&quot;,sans-serif;color:#F2F2F2;mso-no-proof:yes"> Notification</span><span style="mso-no-proof:yes"><o:p></o:p></span></a></p>
                             </td>
                                </tr>
                                <tr>
                                <td bgcolor="#ffffff" style="padding: 40px 30px 40px 30px;">
                                    <p style="font-size: 16px; color: #666666;">Dear CC,</p>
                                    <p style="font-size: 16px; color: #666666;">RITMXXXXXXX and the following items need to be provided and to be attached in the RITMXXXXXXX</p>
                                    <!-- 动态内容插入占位符 -->
                                    {dynamic_content}
                                    <p style="font-size: 16px; color: #666666;">Best regards,<br></p>
                                </td>
                                </tr>
                            </table>
                            </body>
                            </html>
    '''    
    dynamic_content = []

    # 根据复选框状态追加对应内容
    if checkbox_documents.get():
        check_sub()
        dynamic_content.append('''
        <p style="font-size: 16px; color: #666666"><strong>Documents to be attached to Request:</strong></p>
            <ul>
            <li style="font-size: 16px; color: #666666"><strong>Implementation Instructions:</strong> Explain in detail how the change is deployed, roles or groups involved, and tools used.
            </ul>
        ''')

    if checkbox_description.get():
        dynamic_content.append('''
        <p style="font-size: 16px; color: #666666"><strong>Description: </strong></p>
            <ul>
            <li style="font-size: 16px; color: #666666">What is Scope of this Standard change activity. Provide detail, clear and concise description in 2 or 3 sentences of what is being deployed.</li>
        ''')
    
    if checkbox_configuration_item.get():
        dynamic_content.append('''
        <p style="font-size: 16px; color: #666666"><strong>List of Config:</strong></p>
        ''')
        
    if checkbox_category.get():
        dynamic_content.append('''       
        <p style="font-size: 16px; color: #666666"><strong>Standard Type [choose one of the below]:</strong></p>
            <ul>
            <li style="font-size: 16px; color: #666666">Application – Code</li>
            <li style="font-size: 16px; color: #666666">Application &amp; Database – Code</li>
            </ul>
        ''')
    
    # 拼接动态内容并替换模板占位符
    body_mail = base_body.format(dynamic_content=''.join(dynamic_content))
    return body_mail

优化说明 #

• 移除冗余占位：基础模板彻底删除了所有隐藏段落，避免无效HTML代码残留
• 动态内容收集：用列表统一收集勾选复选框对应的HTML片段，替代多次字符串替换操作，逻辑更直观
• 模板化替换：通过占位符{dynamic_content}统一插入动态内容，后续新增复选框只需追加新片段，无需修改基础模板
• 性能更优：字符串拼接效率高于多次replace操作，代码可维护性更强

内容的提问来源于stack exchange，提问作者Rafael Muller