Decoding the Transaction

import struct

def decode_varint(stream):
    n = stream[0]
    if n < 0xFD:
        return n, 1
    elif n == 0xFD:
        return struct.unpack("<H", stream[1:3])[0], 3
    elif n == 0xFE:
        return struct.unpack("<I", stream[1:5])[0], 5
    elif n == 0xFF:
        return struct.unpack("<Q", stream[1:9])[0], 9

def deserialize_tx(serialized_tx):
    offset = 0
    
    version = struct.unpack("<L", serialized_tx[offset:offset+4])[0]
    offset += 4
    
    vin_count, vin_offset = decode_varint(serialized_tx[offset:])
    offset += vin_offset
    vin = []
    for _ in range(vin_count):
        txid = serialized_tx[offset:offset+32][::-1].hex()
        offset += 32
        vout = struct.unpack("<L", serialized_tx[offset:offset+4])[0]
        offset += 4
        script_length, script_offset = decode_varint(serialized_tx[offset:])
        offset += script_offset
        scriptsig = serialized_tx[offset:offset+script_length].hex()
        offset += script_length
        sequence = struct.unpack("<L", serialized_tx[offset:offset+4])[0]
        offset += 4
        vin.append({"txid": txid, "vout": vout, "scriptsig": scriptsig, 
                    "sequence": sequence})
    
    vout_count, vout_offset = decode_varint(serialized_tx[offset:])
    offset += vout_offset
    vout = []
    for _ in range(vout_count):
        value = struct.unpack("<Q", serialized_tx[offset:offset+8])[0]
        offset += 8
        script_length, script_offset = decode_varint(serialized_tx[offset:])
        offset += script_offset
        scriptpubkey = serialized_tx[offset:offset+script_length].hex()
        offset += script_length
        vout.append({"value": value, "scriptpubkey": scriptpubkey})
    
    locktime = struct.unpack("<L", serialized_tx[offset:offset+4])[0]
    
    return {
        "version": version,
        "vin": vin,
        "vout": vout,
        "locktime": locktime
    }

serialized_tx = "0100000002b9a2c28ea00905a5d24a172598b9574fbd973fc085df49901208a358d29a233b000000001716001415ff0337937ecadd10ce56ffdfd4674817613223f0ffffff8415e7099fba6d81474912d22eb5113bcdcfe45a4a1ae0c2701549a46326384f010000001716001415ff0337937ecadd10ce56ffdfd4674817613223f0ffffff02007daf01000000001976a91471a3d2f54b0917dc9d2c877b2861ac52967dec7f88ac2073f6010000000017a914423877331b30a905240c7e1f2adee4ebaa47c5f68700000000"
transaction = deserialize_tx(bytes.fromhex(serialized_tx))
print("Version:", transaction["version"])
print("Vin:")
for inp in transaction["vin"]:
    print("  TXID:", inp["txid"])
    print("  Vout:", inp["vout"])
    print("  ScriptSig:", inp["scriptsig"])
    print("  Sequence:", inp["sequence"])
print("Vout:")
for out in transaction["vout"]:
    print("  Value:", out["value"])
    print("  ScriptPubKey:", out["scriptpubkey"])
print("Locktime:", transaction["locktime"])