code: def get_keys(self, transport, bucket, timeout=None):
          
          if not riak.disable_list_exceptions:
              raise ListError()
  
          _validate_timeout(timeout)
  
          return transport.get_keys(bucket, timeout=timeout)
docs: get_keys(bucket, timeout=None)
  
          Lists all keys in a bucket.
  
          .. warning:: Do not use this in production, as it requires
             traversing through all keys stored in a cluster.
  
          .. note:: This request is automatically retried :attr:`retries`
             times if it fails due to network error.
  
          :param bucket: the bucket whose keys are fetched
          :type bucket: RiakBucket
          :param timeout: a timeout value in milliseconds
          :type timeout: int
          :rtype: list