bitcoin tutorial assignment

from bitcoin.wallet import *
from bitcoin.base58 import *
import hashlib*
import bitcoin *
from bitcoin.core import *
from bitcoin.core.script import *
import bitcoin, bitcoin.core, bitcoin.core.script, bitcoin.core.scripteval, bitcoin.wallet
from bitcoin.wallet import *
from bitcoin.signmessage import *


key = "5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcn"
key2 = "5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcnada"
try:
    secret = CBitcoinSecret(key)
    print(secret)
    secret2 = CBitcoinSecret(key2)
except Base58ChecksumError:
    print("Invalid Base 58 Key")


key = "5J3mBbAH58CpQ3Y5RNJpUKPE62SQ5tfcvU2JpbnkeyhfsYB1Jcn"
msg = "message to sign"

secret = CBitcoinSecret(key)
message = BitcoinMessage(msg)
signature = SignMessage(secret, message)

address = P2PKHBitcoinAddress.from_pubkey(secret.pub)
message = BitcoinMessage(msg)
verify = VerifyMessage(address, message, signature)
print('Address: %s' % address)
print('Message: %s' % msg)
print('Signature: %s' % signature)
print('Verified: %s' % verify)
print("\n")
print('Verify using bitcoin core this command:')
print('\n`bitcoin-cli verifymessage %s \'%s\' \'%s\'`\n' % (address, signature.decode('ascii'), msg))


bitcoin.SelectParams('mainnet')

h = hashlib.sha256(b'wallet secret key').digest()
seckey = CBitcoinSecret.from_secret_bytes(h)

# Creating Script Pub Key
txin_scriptPubKey = CScript([OP_DUP, OP_HASH160, Hash160(seckey.pub), OP_EQUALVERIFY, OP_CHECKSIG])

# Calculate the signature hash for that transaction
sighash = SignatureHash(txin_scriptPubKey, tx, 0, SIGHASH_ALL)
print(sighash)


bitcoin.SelectParams('mainnet')

h = hashlib.sha256(b'wallet secret key').digest()
seckey = CBitcoinSecret.from_secret_bytes(h)

# lx corresponds to little endian hex
txid = lx('010862f9588f760b4a007cc316baa38890d5e102dc8cee923aae396260e13cb1')
vout = 0

# Create the txin structure, which includes the outpoint
txin = CMutableTxIn(COutPoint(txid, vout))
print(txin)

# Creating Script Pub Key
param = [OP_DUP, OP_HASH160, Hash160(seckey.pub), OP_EQUALVERIFY, OP_CHECKSIG]
txin_scriptPubKey = CScript(param)

# Create txout object
txout = CMutableTxOut(0.001*COIN, CBitcoinAddress('1CaJbGDKkk2DzWNAgHs6sgMdMJZ9eXvCs7').to_scriptPubKey())

# Create unsigned transaction
tx = CMutableTransaction([txin], [txout])

sighash = SignatureHash(txin_scriptPubKey, tx, 0, SIGHASH_ALL)

sig = seckey.sign(sighash) + bytes([SIGHASH_ALL])

txin.scriptSig = CScript([sig, seckey.pub])

VerifyScript(txin.scriptSig, txin_scriptPubKey, tx, 0, (SCRIPT_VERIFY_P2SH,))

print(bitcoin.core.b2x(tx.serialize()))