human
I wrote the below code

    def _check_components(complist):
        if (len({convert(c) for c in complist}) != len(complist)):
            raise ValueError('Some    paths    in    {!r}    convert    to    the    same    object,    please    update    your    settings'.format(complist))
    def _map_keys(compdict):
        if isinstance(compdict, BaseSettings):
            compbs = BaseSettings()
            for (k, v) in six.iteritems(compdict):
                prio = compdict.getpriority(k)
                if (compbs.getpriority(convert(k)) == prio):
                    raise ValueError('Some    paths    in    {!r}    convert    to    the    same    object,    please    update    your    settings'.format(list(compdict.keys())))
                else:
                    compbs.set(convert(k), v, priority=prio)
            return compbs
        else:
            _check_components(compdict)
            return {convert(k): v for (k, v) in six.iteritems(compdict)}
    def _validate_values(compdict):
        'Fail    if    a    value    in    the    components    dict    is    not    a    real    number    or    None.'
        for (name, value) in six.iteritems(compdict):
            if ((value is not None) and (not isinstance(value, numbers.Real))):
                raise ValueError('Invalid    value    {}    for    component    {},    please    provide    a    real    number    or    None    instead'.format(value, name))
    if isinstance(custom, (list, tuple)):
        _check_components(custom)
        return type(custom)((convert(c) for c in custom))
    if (custom is not None):
        compdict.update(custom)
    _validate_values(compdict)
    compdict = without_none_values(_map_keys(compdict))
    return [k for (k, v) in sorted(six.iteritems(compdict), key=itemgetter(1))]

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

def build_component_list(compdict, custom=None, convert=update_classpath):