docs: def get_attribute(json, attr):
      """ Gets the values of an attribute from JSON
  
      Args:
          json: JSON data as a list of dict dates, where the keys are
              the raw market statistics.
          attr: String of attribute in JSON file to collect.
  
      Returns:
          List of values of specified attribute from JSON
      """
      res = [json[entry][attr] for entry, _ in enumerate(json)]
      logger.debug('{0}s (from JSON):\n{1}'.format(attr, res))
      return res