Password automation

pyexpect

# coding: utf-8
import pty
import os
import sys

commands = ["some-command", "--with", "options"]
pid, child_fd = pty.fork()
if not pid:
    os.execv(commands[0], commands)
    
# you may use getpass here    
password = "secRetPa33w0rd"
while True:
    try:
        output = os.read(child_fd, 1024).strip()
    except OSError:
        break
    # the following two lines are not really necessary though
    sys.stdout.write("output: %s\n" % output)
    sys.stdout.flush()
    lower = output.lower()
    if lower.endswith("password:"):
        os.write(child_fd, "%s\n" % password)
    elif 'are you sure' in lower:
        os.write(child_fd, "y\n")