def add(self, element):
        """
        Adds an element to the HyperLogLog. Datatype cardinality will
        be updated when the object is saved.

        :param element: the element to add
        :type element: str
        """
        if not isinstance(element, six.string_types):
            raise TypeError("Hll elements can only be strings")
        self._adds.add(element)
Adds an element to the HyperLogLog. Datatype cardinality will
        be updated when the object is saved.

        :param element: the element to add
        :type element: str