'If all of list_a exists in list_b, return True'

def _compare_dictionary_lists(self, list_a, list_b):

    if ((not isinstance(list_a, list)) or (not isinstance(list_b, list))):
        return False
    matches = 0
    for dict_a in list_a:
        for dict_b in list_b:
            if self._compare_dicts(dict_a, dict_b):
                matches += 1
                break
    result = (matches == len(list_a))
    return result
