human
Here's a good function header given the following:
I wrote the below code

    if (not isinstance(yaml_data, string_types)):
        yaml_data = yaml_data.read()
    with warnings.catch_warnings(record=True) as warn_list:
        try:
            data = load(yaml_data, Loader=get_yaml_loader(argline))
        except ScannerError as exc:
            err_type = _ERROR_MAP.get(exc.problem, exc.problem)
            line_num = (exc.problem_mark.line + 1)
            raise SaltRenderError(err_type, line_num, exc.problem_mark.buffer)
        except (ParserError, ConstructorError) as exc:
            raise SaltRenderError(exc)
        if (len(warn_list) > 0):
            for item in warn_list:
                log.warning('{warn}    found    in    {sls}    saltenv={env}'.format(warn=item.message, sls=salt.utils.url.create(sls), env=saltenv))
        if (not data):
            data = {}
        log.debug('Results    of    YAML    rendering:    \n{0}'.format(data))
        def _validate_data(data):
            "\n                                                PyYAML    will    for    some    reason    allow    improper    YAML    to    be    formed    into\n                                                an    unhashable    dict    (that    is,    one    with    a    dict    as    a    key).    This\n                                                function    will    recursively    go    through    and    check    the    keys    to    make\n                                                sure    they're    not    dicts.\n                                                "
            if isinstance(data, dict):
                for (key, value) in six.iteritems(data):
                    if isinstance(key, dict):
                        raise SaltRenderError('Invalid    YAML,    possible    double    curly-brace')
                    _validate_data(value)
            elif isinstance(data, list):
                for item in data:
                    _validate_data(item)
        _validate_data(data)
        return data

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

def render(yaml_data, saltenv='base', sls='', argline='', **kws):