hash – How to calculate Merkle root? Need a twist?

I downloaded the necessary information and created Coinbase. Then I calculated the merkle root… but when I submit the block I always get the error message “bad-txnmerkleroot”. Here is my code:

def dblsha(d)->bytes:

    return hashlib.sha256(hashlib.sha256(d).digest()).digest()


def makeMerkleRoot()->None:

    global merkleroot,txnlist
    txnlist=(coinbase)+(unhexlify(a('data')) for a in tmpl('transactions'))
    merklehashes=(dblsha
    while len(merklehashes)>1:
        if len(merklehashes)%2:
            merklehashes.append(merklehashes(-1))
        merklehashes=(dblsha(merklehashes(i)+merklehashes(i+1)) for i in range(0,len(merklehashes),2))
    merkleroot=merklehashes(0)(::-1)

1. All transaction data has been reversed (including Coinbase).
2. Calculated hash (bytes).
3. Calculated the merkle root (bytes).
4. I reversed the Merkroot.
5. Converted merkleroot (bytes) to hexadecimal. However, no matter how many times I invert it or not, I always get the error ‘bad-txnmerkleroot’. Do I actually need to flip the data during calculations? By the way, I tested your code in regtest. Need to test your code on the main network? Are there other reasons why the ‘bad-txnmerkle’ error occurs? Like Coinbase gone wrong. I really don’t know what to do.