def _collectAttributes(cls, new_attrs, look_for_class):
    """Finds all attributes in `new_attrs` that are instances of
    `look_for_class`. The ``.name`` attribute is set for any matching objects.
    Returns them as a list.

    """
    result = []
    for attr, value in new_attrs.items():
        if isinstance(value, look_for_class):
            value.name = attr
            delattr(cls, attr)
            result.append(value)
    return result