def _get_fields_by_mro(klass, field_class, ordered=False):
    """Collect fields from a class, following its method resolution order. The
    class itself is excluded from the search; only its parents are checked. Get
    fields from ``_declared_fields`` if available, else use ``__dict__``.

    :param type klass: Class whose fields to retrieve
    :param type field_class: Base field class
    """
    mro = inspect.getmro(klass)
    # Loop over mro in reverse to maintain correct order of fields
    return sum(
        (
            _get_fields(
                getattr(base, '_declared_fields', base.__dict__),
                field_class,
                ordered=ordered,
            )
            for base in mro[:0:-1]
        ),
        [],
    )
def _get_fields_by_mro ( klass , field_class , ordered = False ) : mro = inspect . getmro ( klass ) return sum ( ( _get_fields ( getattr ( base , '_declared_fields' , base . __dict__ ) , field_class , ordered = ordered , ) for base in mro [ : 0 : - 1 ] ) , [ ] , )
Collect fields from a class, following its method resolution order. The
    class itself is excluded from the search; only its parents are checked. Get
    fields from ``_declared_fields`` if available, else use ``__dict__``.

    :param type klass: Class whose fields to retrieve
    :param type field_class: Base field class