Convert a last_evaluated_key parameter into the data structure
        required for Layer1.

def dynamize_last_evaluated_key(self, last_evaluated_key):
        """
        Convert a last_evaluated_key parameter into the data structure
        required for Layer1.
        """
        d = None
        if last_evaluated_key:
            hash_key = last_evaluated_key['HashKeyElement']
            d = {'HashKeyElement': self.dynamize_value(hash_key)}
            if 'RangeKeyElement' in last_evaluated_key:
                range_key = last_evaluated_key['RangeKeyElement']
                d['RangeKeyElement'] = self.dynamize_value(range_key)
        return d