How to send message to a Slack channel in Python

Question

I need sending out message to a Slack channel with Python.

My Google search here and search right from our Stack Overflow sitehere results in little helpful. What is the right way to get it working?

The closest guide I found is from Slack official guide here but it's not clear how to do the authentication with SLACK_BOT_TOKEN to call client.chat_postMessage()

from slack_sdk import WebClient
client = WebClient(token=os.environ.get("SLACK_BOT_TOKEN"))

result = client.chat_postMessage(
    channel=channel_id,
    text="Hello world!"
)

Answer 1

In brief

• create Slack app aka myslackchat ref

• grant scope chat:write to Slack app ref

• get Slack channel id aka channel id

• get SLACK_BOT_TOKEN of your Slack app

• add Slack app myslackchat to your Slack workspace, and 2nd, add myslackchat to Slack channel channel id

• python code to send message to channel id, with SLACK_BOT_TOKEN ref

p.s.

How to get

After days seeking Slack documentation for it, here is related guide; please search the page to get to this section OAuth Tokens for Your Workspace - this is a pain ^^ I have no idea why there is no SLACK_BOT_TOKEN mentioned in this guide

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Full details

One thing you'll need before starting is a Slack app. If you don't have one yet, here's a very quick guide to help you create one.

Requesting the necessary permissions chat:write. This one grants permission for your app to send messages as itself (apps can send messages as users or bot users)

Requesting these permissions is easy:

• Load up the settings for your app from the app management page.
• In the navigation menu, choose the OAuth & Permissions feature.
• Scroll down to the Scopes section, and pick channels:read and chat:write from the drop down menu.
• Click save changes.
• Scroll back to the top of this page and look for the button that says Install App to Workspace (or Reinstall App if you've done this before). Click it.