code: def retrieve_object(cache, template, indexes):
      
      keys = []
      with cache as redis_connection:
          pipe = redis_connection.pipeline()
          for (result_key, redis_key_template) in template.items():
              keys.append(result_key)
              pipe.get(redis_key_template % indexes)
          results = pipe.execute()
      return None if None in results else dict(zip(keys, results))
docs: Retrieve an object from Redis using a pipeline.
  
      Arguments:
          template: a dictionary containg the keys for the object and
              template strings for the corresponding redis keys. The template
              string uses named string interpolation format. Example:
  
              {
                  'username': 'user:$(id)s:username',
                  'email': 'user:$(id)s:email',
                  'phone': 'user:$(id)s:phone'
              }
  
          indexes: a dictionary containing the values to use to cosntruct the
              redis keys: Example:
  
              {
                  'id': 342
              }
  
      Returns: a dictionary with the same keys as template, but containing
          the values retrieved from redis, if all the values are retrieved.
          If any value is missing, returns None. Example:
  
          {
              'username': 'bob',
              'email': 'bob@example.com',
              'phone': '555-555-5555'
          }