code: def is_original_format(tweet):
      
      # deleted due to excess checking; it's a key lookup and does not need any
      # operational optimization
      if "created_at" in tweet:
          original_format = True
      elif "postedTime" in tweet:
          original_format = False
      else:
          raise NotATweetError("This dict has neither 'created_at' or 'postedTime' as keys")
      return original_format
docs: Simple checker to flag the format of a tweet.
  
      Args:
          tweet (Tweet): tweet in qustion
  
      Returns:
          Bool
  
      Example:
          >>> import tweet_parser.tweet_checking as tc
          >>> tweet = {"created_at": 124125125125,
          ...          "text": "just setting up my twttr",
          ...          "nested_field": {"nested_1": "field", "nested_2": "field2"}}
          >>> tc.is_original_format(tweet)
          True