Tokens.py 文件源码

def token_approve_allowance(wallet, args, prompt_passwd=True):

    if len(args) != 4:
        print("please provide a token symbol, from address, to address, and amount")
        return False

    token = get_asset_id(wallet, args[0])
    approve_from = args[1]
    approve_to = args[2]
    amount = amount_from_string(token, args[3])

    tx, fee, results = token.Approve(wallet, approve_from, approve_to, amount)

    if tx is not None and results is not None and len(results) > 0:

        if results[0].GetBigInteger() == 1:
            print("\n-----------------------------------------------------------")
            print("Approve allowance of %s %s from %s to %s" % (string_from_amount(token, amount), token.symbol, approve_from, approve_to))
            print("Transfer fee: %s " % (fee.value / Fixed8.D))
            print("-------------------------------------------------------------\n")

            if prompt_passwd:
                passwd = prompt("[Password]> ", is_password=True)

                if not wallet.ValidatePassword(passwd):
                    print("incorrect password")
                    return

            return InvokeContract(wallet, tx, fee)

    print("could not transfer tokens")
    return False