Can I make a ApplicationCreateTxn or ApplicationNoOpTxn with a multisig transaction?

AlgoSDK
1 
    # create unsigned transaction
    txn = transaction.ApplicationCreateTxn(
        sender,
        params,
        on_complete,
        approval_program,
        clear_program,
        global_schema,
        local_schema,
        extra_pages=extra_pages
    )

    msig = multisig()
    # create a SignedTransaction object
    multisig_transaction = MultisigTransaction(txn, msig)

    # sign transaction
    signed_txn = multisig_transaction.sign(private_key)
    tx_id = signed_txn.transaction.get_txid()

    # send transaction
    client.send_transactions([signed_txn])

I keep getting a TypeError: 'int' object is not iterable.

2

Yes, MultiSig Accounts have all the capabilities of any other Algorand Accounts.

Here is the Python example from MultiSig transactions documentation:

# create a multisig account
version = 1  # multisig version
threshold = 2  # how many signatures are necessary
msig = Multisig(version, threshold, [account_1, account_2])

print("Multisig Address: ", msig.address())
print("Please go to: https://bank.testnet.algorand.network/ to fund multisig account.", msig.address())
# input("Please go to: https://bank.testnet.algorand.network/ to fund multisig account." + '\n' + "Press Enter to continue...")

# Specify your node address and token. This must be updated.
algod_address = ""  # ADD ADDRESS
algod_token = ""  # ADD TOKEN


# Initialize an algod client
algod_client = algod.AlgodClient(algod_token, algod_address)

# get suggested parameters
params = algod_client.suggested_params()
# comment out the next two (2) lines to use suggested fees
params.flat_fee = True
params.fee = 1000


# create a transaction
sender = msig.address()
recipient = account_3
amount = 10000
note = "Hello Multisig".encode()
txn = PaymentTxn(sender, params, recipient, amount, None, note, None)


# create a SignedTransaction object
mtx = MultisigTransaction(txn, msig)

# sign the transaction
mtx.sign(private_key_1)
mtx.sign(private_key_2)

# send the transaction
txid = algod_client.send_raw_transaction(
    encoding.msgpack_encode(mtx))
    # wait for confirmation 
try:
    confirmed_txn = wait_for_confirmation(algod_client, txid, 4)  
    print("Transaction information: {}".format(
        json.dumps(confirmed_txn, indent=4)))
    print("Decoded note: {}".format(base64.b64decode(
        confirmed_txn["txn"]["txn"]["note"]).decode()))
except Exception as err:
    print(err)
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