sign.py

import bitcoin

def sign_all_ins(unsigned_tx, priv, nb_ins=None):
    utxo = nb_ins
    if utxo == None:
        utxo = len(bitcoin.unspent(bitcoin.privtoaddr(priv)))
    for i in range(utxo):
        signed_tx = bitcoin.sign(unsigned_tx, i, priv)
    return signed_tx

if __name__ == '__main__':
    HEX = raw_input("Input previous txid(transaction hash).")
    PRIVATE_KEY = raw_input("Input private key.")
    deserialize_hex = bitcoin.deserialize(HEX)
    ins = deserialize_hex['ins']
    signed_tx = sign_all_ins(HEX, PRIVATE_KEY, len(ins))
    print(signed_tx)