Sort object list in python

sort_query_set_objects.py

def sort_query_set_objects(query_set, attr=None):
    """
    Convert queryset to a list array and sort by field with order ASC/DESC.
    Use when you have to apply ordering to queryset but don't want to do it via database.
    :param query_set: queryset
    :param attr: query object attribute (field) name with order direction. Usage is same as order_by()
    :return: list array w/wo sorted
    """
    object_list = list(query_set)

    if attr is None:
        return object_list
    else:
        if attr.startswith("-"):
            reverse = True
            attr_name = attr[1:]
        else:
            reverse = False
            attr_name = attr

    from operator import attrgetter
    object_list.sort(key=attrgetter(attr_name), reverse=reverse)

    return object_list