`eth_getTransactionByBlockHashAndIndex`
        `eth_getTransactionByBlockNumberAndIndex`

def getTransactionByBlock(self, block_identifier, transaction_index):
        """
        `eth_getTransactionByBlockHashAndIndex`
        `eth_getTransactionByBlockNumberAndIndex`
        """
        method = select_method_for_block_identifier(
            block_identifier,
            if_predefined='eth_getTransactionByBlockNumberAndIndex',
            if_hash='eth_getTransactionByBlockHashAndIndex',
            if_number='eth_getTransactionByBlockNumberAndIndex',
        )
        result = self.web3.manager.request_blocking(
            method,
            [block_identifier, transaction_index],
        )
        if result is None:
            raise TransactionNotFound(
                f"Transaction index: {transaction_index} "
                f"on block id: {block_identifier} not found."
            )
        return result