对于微信公众号的开发者来说，发送图文消息是一项常见的任务。下面是一个示例代码来演示如何通过微信API实现群发图文消息。
首先，你需要获取到一个图文消息的素材ID。你可以通过上传图片和上传图文消息素材的接口来实现这一步骤。
1.上传图片获取URL：
```pythonimport requestsdef upload_image(access_token, image_path):
url = " with open(image_path, 'rb') as f:
files = {'media': f}
response = requests.post(url, files=files)
if response.status_code ==200:
data = response.json()
media_id = data['media_id']
return media_id else:
return None```
2.上传图文消息素材：
```pythondef upload_news(access_token, articles):
url = " data = {
"articles": articles }
response = requests.post(url, json=data)
if response.status_code ==200:
result_data = response.json()
media_id = result_data['media_id']
返回媒体ID用于群发操作等后续操作 return media_id```
3. 群发图文消息到指定标签用户：
```pythondef send_news_by_tag(access_token, tag_id, media_id):
url=" data={
"filter":{
"is_to_all":False,
"tag_id":tag_id
},
"mpnews":{
"media_id":media_i
