def is_frozen(G):
    try:
        return G.frozen
    except AttributeError:
        return False
:reference: https://dev.twitter.com/rest/reference/get/friendships/lookup
dataset/ETHPy150Open networkx/networkx/networkx/classes/function.py/is_frozen--crossover with--dataset/ETHPy150Open tweepy/tweepy/tweepy/api.py/API._lookup_friendships