Simplest example of creating chat post using praw

praw-chat-post.py

from praw import Reddit


# Get a Reddit instance
# https://praw.readthedocs.io/en/latest/code_overview/reddit_instance.html#
reddit = Reddit(
  client_id="<client_id>",
  client_secret="<client_secret>",
  username="<user>",
  password="<password>",
  user_agent="Script by /u/markis",
)

# Make direct post against the API
# https://praw.readthedocs.io/en/latest/code_overview/reddit_instance.html#praw.Reddit.post
reddit.post('api/submit/', data={
  "sr": "<subreddit_name>",
  "kind": "self",
  "resubmit": True,
  "sendreplies": True,
  "title": "<post title>",
  "text": "<post text>",
  "nsfw": False,
  "spoiler": False,
  
  # This will make the post a chat-post
  "discussion_type": "CHAT",
})