如何使用Python+Telethon在转发Telegram消息前编辑内容？

问题描述 #

使用Python的Telethon库实现Telegram频道/机器人之间的新消息转发，需要在转发前编辑消息内容（删除部分文本），同时想知道：消息内容动态变化但都包含特定关键词时，能否基于关键词删除其前后的内容？

当前代码 #

from telethon import TelegramClient, events
import asyncio

api_id = 99999999
api_hash = 'xxxxxxxxxxxxxxxxxxxxxxxxxx'

my_channel_id = -10000000000000
channels = [-1000000000000]

client = TelegramClient('myGrab', api_id, api_hash)
print("GRAB - Started")

@client.on(events.NewMessage(chats=channels))
async def my_event_handler(event):
    if event.message:
        await client.send_message(my_channel_id, event.message)


client.start()
client.run_until_disconnected()

原始消息示例 #

The Button LTDSH 11 has matched with 
a live Match

Adelaide United ||(4) V NE MetroStars(1)
🇦🇺 Australia :- Npl South Australian
⏱ Elapsed Time: 55'
⚽️ Score: 1 - 1

Home Shots: on:off Target: 3:1
Away Shots: on:off Target: 2:7

Home Possession: 37%
Away Possession: 63%

Home Dangerous Attacks: 30
Away Dangerous Attacks: 39

📈AP1 (H:A): 27:33
Form (H:A): LLDLD:WWDWW

Home Corners: 2
Away Corners: 5

Last 10mins Shots on Target
Home:Away 1 : 0

💰Odds (H:D:A)
Starting 5.50 : 4.75 : 1.40
Live     8.50 : 4.33 : 1.33

期望编辑后的格式 #

The Button LTDSH 11 has matched with a live Match

Adelaide United ||(4) V NE MetroStars(1)
🇦🇺 Australia :- Npl South Australian
⏱ Elapsed Time: 55'
⚽️ Score: 1 - 1

💰Odds (H:D:A)
Live     8.50 : 4.33 : 1.33

解决方案 #

针对示例需求的代码修改 #

要编辑消息内容，不能直接转发event.message，需要提取文本内容处理后再发送。以下是适配示例需求的修改代码：

from telethon import TelegramClient, events

api_id = 99999999
api_hash = 'xxxxxxxxxxxxxxxxxxxxxxxxxx'

my_channel_id = -10000000000000
channels = [-1000000000000]

client = TelegramClient('myGrab', api_id, api_hash)
print("GRAB - Started")

@client.on(events.NewMessage(chats=channels))
async def my_event_handler(event):
    if event.message and event.message.text:
        original_text = event.message.text
        
        # 处理标题换行，合并成一行
        title_fixed = original_text.split("⚽️ Score:")[0].replace("\na live Match", " a live Match")
        # 提取到Score行的完整内容
        first_section = title_fixed + "⚽️ Score:" + original_text.split("⚽️ Score:")[1].split("\n\n")[0]
        
        # 提取Odds部分，只保留Live赔率行
        odds_section = original_text.split("💰Odds (H:D:A)")[1]
        live_odds = next(line for line in odds_section.split("\n") if line.strip().startswith("Live"))
        
        # 拼接最终文本
        processed_text = f"{first_section}\n\n💰Odds (H:D:A)\n{live_odds}"
        
        await client.send_message(my_channel_id, processed_text)

client.start()
client.run_until_disconnected()

基于关键词的通用处理方案 #

如果消息内容动态变化，但固定包含特定关键词（比如示例中的⚽️ Score:和💰Odds (H:D:A)），可以用关键词分割文本，精准保留需要的部分，代码如下：

from telethon import TelegramClient, events

api_id = 99999999
api_hash = 'xxxxxxxxxxxxxxxxxxxxxxxxxx'

my_channel_id = -10000000000000
channels = [-1000000000000]

client = TelegramClient('myGrab', api_id, api_hash)
print("GRAB - Started")

@client.on(events.NewMessage(chats=channels))
async def my_event_handler(event):
    if event.message and event.message.text:
        original_text = event.message.text
        # 定义固定存在的关键词
        score_key = "⚽️ Score:"
        odds_key = "💰Odds (H:D:A)"
        
        # 提取从开头到Score行的内容
        score_part = original_text.split(score_key)[1].split("\n")[0]
        first_section = original_text.split(score_key)[0] + score_key + score_part
        
        # 提取Odds部分中的Live行
        odds_part = original_text.split(odds_key)[1]
        live_line = next(line for line in odds_part.split("\n") if line.strip().startswith("Live"))
        
        # 拼接最终文本
        processed_text = f"{first_section}\n\n{odds_key}\n{live_line}"
        await client.send_message(my_channel_id, processed_text)

client.start()
client.run_until_disconnected()

这种方法无需关注中间动态变化的内容，只要关键词存在，就能准确截取需要保留的部分，适配不同的消息内容。

内容的提问来源于stack exchange，提问作者Marcello Gabrielli