code: def lookup(self, lookup_url, url_key=None):
          
          url_ending = self._get_ending(lookup_url)
          params = {
              'url_ending': url_ending,
              'url_key': url_key
          }
          data, r = self._make_request(self.api_lookup_endpoint, params)
          if r.status_code == 401:
              if url_key is not None:
                  raise exceptions.UnauthorizedKeyError('given url_key is not valid for secret lookup.')
              raise exceptions.UnauthorizedKeyError
          elif r.status_code == 404:
              return False  # no url found in lookup
          action = data.get('action')
          full_url = data.get('result')
          if action == 'lookup' and full_url is not None:
              return full_url
          raise exceptions.DebugTempWarning
docs: Looks up the url_ending to obtain information about the short url.
  
          If it exists, the API will return a dictionary with information, including
          the long_url that is the destination of the given short url URL.
  
  
          The lookup object looks like something like this:
  
          .. code-block:: python
  
              {
                  'clicks': 42,
                  'created_at':
                      {
                          'date': '2017-12-03 00:40:45.000000',
                          'timezone': 'UTC',
                          'timezone_type': 3
                      },
                  'long_url': 'https://stackoverflow.com/questions/tagged/python',
                  'updated_at':
                      {
                          'date': '2017-12-24 13:37:00.000000',
                          'timezone': 'UTC',
                          'timezone_type': 3
                      }
              }
  
          :param str lookup_url: An url ending or full short url address
          :param url_key: optional URL ending key for lookups against secret URLs
          :type url_key: str or None
          :return: Lookup dictionary containing, among others things, the long url; or None if not existing
          :rtype: dict or None