Using the Slack API with Python – A Simple Example

Here is a simple Python program that can be used to:

  • Test the API
  • Get a list of Slack Users
  • Get a list of Slack Channels
  • Get information about a Slack Channel
  • Post a message to Slack Channel

Students in my Intro to Programming and Problems Solving class at Clark College learn how to build this and other things using Python.

Have fun with it!

On Github >

# CTEC 121 / Intro to Programming and Problem Solving
# Lab - Using the Slack API
# by Bruce Elgort, 2016

# pip install slackclient to install SlackClient library
from slackclient import SlackClient
import json

def test_slack(sc):
    # use for debugging
    print("Testing API")
    print(80 * "=")
    print (sc.api_call("api.test"))

def get_channel_info(sc,channel):
    # get info about the channel
    print("Getting Channel Info")
    print(80 * "=")
    print (sc.api_call("", channel=channel))

def get_list_of_channels(sc):
    print("Getting List of Channels")
    print(80 * "=")
    # get list of channels
    channels = sc.api_call("channels.list")
    channels = json.dumps(channels)
    channels = json.loads(str(channels))
    return channels

def display_channels(channels):
    print("Display Channels")
    print(80 * "=")
    for i in channels['channels']:

def post_message(sc,text,channel,icon_url,username):
    print("Posting Message to Slack")
    print(80 * "=")
    # post a message into the #general channel
    print (sc.api_call("chat.postMessage",channel=channel,text=text,username=username,icon_url=icon_url,unfurl_links="true"))

def get_users(sc):
    print("Get Users")
    print(80 * "=")
    #call the users.list api call and get list of users
    users = (sc.api_call("users.list"))
    users = json.dumps(users)
    users = json.loads(str(users))
    return users

def display_users(sc,users):
    print("User List")
    print(80 * "=")
    # display active users
    for i in users['members']:
        # don't display slackbot
        if i['profile']['real_name'] != "slackbot":
            # don't display deleted users
            if not i['deleted']:
                # display real name
                print (i['profile']['real_name'])
def main():
    # define variables
    token = "your token"
    channel = "a channel id"
    username = "Username to use display for message function"
    icon_url = "icon url for message function"
    # connect to Slack
    sc = SlackClient(token)
    # test slack
    # get channel info
    # get list of channels
    channels = get_list_of_channels(sc)
    # display channels
    # post message
    # get users
    users = get_users(sc)
    # display users


Published by Bruce Elgort

You’ll find this technology professor – an award-winning instructor at Clark College – working hard to inspire and challenge his students with meaningful web development and programming experiences. With a skinny vanilla latte (no foam) in hand, Bruce loves to tinker and test the boundaries of existing and emerging technologies, to then guide hungry minds through memorable, educational journeys to showcase with passion the ever-evolving innovations of society. An industry leader, Bruce is known for co-developing Elguji’s IdeaJam software, and is recognized by IBM as an ‘IBM Champion’ for being an innovative thought leader in cloud technologies.

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