@environmentfilter
def do_groupby(environment, value, attribute):
    expr = make_attrgetter(environment, attribute)
    return sorted(map(_GroupTuple, groupby(sorted(value, key=expr), expr)))
Test if the address is reserved for multicast use.
dataset/ETHPy150Open GoogleCloudPlatform/appengine-flask-skeleton/lib/jinja2/filters.py/do_groupby--crossover with--dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/ipaddress.py/IPv4Address.is_multicast