Con listas

import praw
import time

#Creo una instancia de Reddit
reddit = praw.Reddit(client_id='kgNcJc52YxrqhQ', client_secret="GGV2z1gXvScnRsC5slcPMpxmFKY",
                     password='Correplatano!23', user_agent='script:testsscript:v0.1 by /u/cuakcuak8',
                     username='cuakcuak8')
#Compruebo que puedo hacer peticiones
#print(reddit.user.me())


subreddit = reddit.subreddit('AskReddit')
"""
print(subreddit.display_name) # Output: redditdev
print(subreddit.title) # Output: reddit Development
print(subreddit.description) # Output: A subreddit for discussion of ...
"""
# assume you have a Subreddit instance bound to variable `subreddit`
for submission in subreddit.top(limit=5):
    comentariosPost=[]

    titulo=submission.title
    contenido=submission.selftext
    fecha=time.strftime('%Y-%m-%d %H:%M:%S GMT', time.localtime(submission.created_utc))
    tipoDeEntrada="Post"

    comentariosPost.append([titulo,contenido,fecha,tipoDeEntrada])

    if hasattr(submission,"replace_more_comments"):
        submission.replace_more_comments(limit=None)
    for comment in submission.comments.list():
        titulo=""
        contenido=comment.body
        fecha=time.strftime('%Y-%m-%d %H:%M:%S GMT', time.localtime(comment.created_utc))
        tipoDeEntrada="Comentario"
        comentariosPost.append([titulo,contenido,fecha,tipoDeEntrada])