A simple reddit json requester written in python

simplereddit.py

import urllib2
import json
import time

def get(o, p, d=None):
  keys = p.split('.')
  rv = o
  for key in keys:
    if isinstance(rv, dict) and key in rv:
      rv = rv[key]
    else:
      return d
  return rv

def delayed_urlopen(url):
  # throttle connections by 2 secs, otherwise you might get a 429
  time.sleep(2)
  hdr = { 'User-Agent' : 'subreddit recommender by /u/_saltymule_' }
  req = urllib2.Request(url, headers=hdr)
  return urllib2.urlopen(req)

def get_hot(subreddit):
  url = "https://www.reddit.com/r/"+subreddit+"/hot.json"
  response = delayed_urlopen(url)
  data = json.load(response)
  return [post["data"] for post in  get(data, "data.children", [])]

def realize_commentlist(comment):
  topitem = get(comment, "data", None)
  if topitem is None:
    return []
  result = [comment["data"]]
  for reply in get(comment, "data.replies.data.children", []):
    result.extend(realize_commentlist(reply))
  return result

def get_postcomments(permalink):
  url = "https://www.reddit.com"+permalink+".json"
  response = delayed_urlopen(url)
  data = json.load(response)
  result = []
  # I feel like there is a way to do this more pythonically
  for listing in data:
      for child in get(listing, "data.children", []):
          if child["kind"] == "t1":
              result.extend(realize_commentlist(child))
  return result

def get_usercomments(username):
  url = "https://www.reddit.com/user/"+username+"/comments/.json?count=100"
  response = delayed_urlopen(url)
  data = json.load(response)
  return [comment["data"] for comment in get(data, "data.children", [])]