praw_iterate_comments.py

import praw

CLIENT_ID = 'YOUR_CLIENT_ID'
CLIENT_SECRET = 'YOUR_CLIENT_SECRET'
REDDIT_USERNAME = 'your reddit username'

# https://www.reddit.com/r/singapore/comments/8eoesx/rsingapore_random_discussion_and_small_questions/
submission_id = '8eoesx'

reddit = praw.Reddit(client_id=CLIENT_ID, client_secret=CLIENT_SECRET,
                     user_agent='Markov Text Generation from Reddit Comments by /u/' + REDDIT_USERNAME)
submission = reddit.submission(id=submission_id)
submission.comments.replace_more(limit=None)

# here is our comment iterator
for comment in submission.comments.list():
    # Python 3.6 f-string syntax (https://www.python.org/dev/peps/pep-0498/)
    print(f'{comment.author}: {comment.body}')

    # pre-Python 3.6
    # print('{}: {}'.format(comment.author, comment.body))