如何在Telegram机器人输出中实现特定文本加粗显示？

问题原因 #

Telegram Bot API默认不会自动解析Markdown格式文本，必须显式指定消息的parse_mode参数，否则用*包裹的文本只会原样显示，无法渲染为加粗样式。

解决方案 #

1. 统一为目标字段添加*包裹 #

先修改get_profile_context函数，把所有需要加粗的参数都用*包裹：

def get_profile_context(site_name):
    """Find the profile context based on the site name, case-insensitive."""
    site_name = site_name.lower()
    site_info = site_data[site_data['site_name'].str.lower() == site_name]

    if not site_info.empty:
        row = site_info.iloc[0]
        # 为所有需要加粗的字段添加*包裹
        context = (
            f"- Enodeb ID: *{row['enodeb_id']}*\n"
            f"- Site ID: *{row['site_id']}*\n"
            f"- MC: *{row['mc']}*\n"
            f"- TAC: *{row['tac']}*\n"
            f"- Region: *{row['region']}*\n"
            f"- Regency: *{row['regency']}*\n"
            f"- Antenna Height: *{row['antenna_height']}*\n"
            f"- Azimuth: *{row['azimuth']}*\n"
        )
        print(context)
        global context_global
        context_global = context
        return context
    else:
        return "Site name not found."

2. 指定消息解析模式 #

在调用edit_message_text时添加parse_mode='MarkdownV2'参数，让Telegram识别并渲染Markdown格式：

async def button(update: Update, context: ContextTypes.DEFAULT_TYPE):
    query = update.callback_query
    await query.answer()

    if query.data == 'profile_site':
        profile_context = get_profile_context(status["site_name"])
        # 添加parse_mode参数，启用MarkdownV2解析
        await query.edit_message_text(
            text=f"Profile of site '*{status['site_name']}*':\n{profile_context}",
            parse_mode='MarkdownV2'
        )
        keyboard = [
            [InlineKeyboardButton("Back to Menu", callback_data='back_to_menu'),
            InlineKeyboardButton("Back to Start", callback_data='start')]
        ]
        reply_markup = InlineKeyboardMarkup(keyboard)
        await query.message.reply_text("What would you like to do next?", reply_markup=reply_markup)

3. 处理特殊字符（可选） #

如果参数中包含_、*、[等Telegram MarkdownV2特殊字符（比如示例中的3_0），需要转义后再拼接，否则消息会发送失败。可以添加辅助转义函数：

def escape_markdown_v2(text):
    """转义Telegram MarkdownV2的特殊字符"""
    special_chars = r'_*[]()~`>#+-=|{}.!'
    return ''.join(f'\\{c}' if c in special_chars else c for c in str(text))

然后在拼接文本时调用该函数：

context = (
    f"- Enodeb ID: *{escape_markdown_v2(row['enodeb_id'])}*\n"
    f"- Site ID: *{escape_markdown_v2(row['site_id'])}*\n"
    f"- MC: *{escape_markdown_v2(row['mc'])}*\n"
    f"- TAC: *{escape_markdown_v2(row['tac'])}*\n"
    f"- Region: *{escape_markdown_v2(row['region'])}*\n"
    f"- Regency: *{escape_markdown_v2(row['regency'])}*\n"
    f"- Antenna Height: *{escape_markdown_v2(row['antenna_height'])}*\n"
    f"- Azimuth: *{escape_markdown_v2(row['azimuth'])}*\n"
)

效果验证 #

修改后，Telegram消息会正确渲染出加粗效果：

Profile of site'--':

• Enodeb ID: 0000
• Site ID: 000000
• MC: MC
• TAC: 00
• Region: NORTH CENTRAL
• Regency: city
• Antenna Height: 61
• Azimuth: 3_0

内容的提问来源于stack exchange，提问作者zulfa novita