human
I wrote the below code

    @CONV_FUNC
    def my_conv(n_messages, messages, p_response, app_data):
        'Simple    conversation    function    that    responds    to    any\n                                prompt    where    the    echo    is    off    with    the    supplied    password'
        addr = CALLOC(n_messages, sizeof(PamResponse))
        p_response[0] = cast(addr, POINTER(PamResponse))
        for i in range(n_messages):
            if (messages[i].contents.msg_style == PAM_PROMPT_ECHO_OFF):
                pw_copy = STRDUP(str(password))
                p_response.contents[i].resp = pw_copy
                p_response.contents[i].resp_retcode = 0
        return 0
    handle = PamHandle()
    conv = PamConv(my_conv, 0)
    retval = PAM_START(service, username, pointer(conv), pointer(handle))
    if (retval != 0):
        PAM_END(handle, retval)
        return False
    retval = PAM_AUTHENTICATE(handle, 0)
    e = PAM_END(handle, retval)
    return ((retval == 0) and (e == 0))

What's a good function header?
assistant
#Here's a good function header.

def authenticate(username, password, service='login'):