Send Slack message with web-hooks on Python

slack-message.py

import json
import requests
webhook_url = "" #Add the webhook here
slack_data = {"text": "This is a test message", "channel": "<channel-name> or <@person>"}

response = requests.post(
    webhook_url, data = json.dumps(slack_data),
    headers={'Content-Type': 'application/json'}
)

if response.status_code != 200:
    raise ValueError(
        'Request to slack returned an error %s, the response is:\n%s'
        % (response.status_code, response.text)
)