https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getunclecountbyblocknumber

        :param block: Block tag or number (optional)
        :type block: int or BLOCK_TAGS

        :return: count
        :rtype: int

def eth_getUncleCountByBlockNumber(self, block=BLOCK_TAG_LATEST):
        """https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getunclecountbyblocknumber

        :param block: Block tag or number (optional)
        :type block: int or BLOCK_TAGS

        :return: count
        :rtype: int
        """
        block = validate_block(block)
        response = yield from self.rpc_call('eth_getUncleCountByBlockNumber',
                                            [block])
        if response:
            return hex_to_dec(response)
        return response