code: def is_partition(G, communities):
      """Returns *True* if `communities` is a partition of the nodes of `G`.
  
      A partition of a universe set is a family of pairwise disjoint sets
      whose union is the entire universe set.
  
      Parameters
      ----------
      G : NetworkX graph.
  
      communities : list or iterable of sets of nodes
          If not a list, the iterable is converted internally to a list.
          If it is an iterator it is exhausted.
  
      """
      # Alternate implementation:
      # return all(sum(1 if v in c else 0 for c in communities) == 1 for v in G)
      if not isinstance(communities, list):
          communities = list(communities)
      nodes = {n for c in communities for n in c if n in G}
  
      return len(G) == len(nodes) == sum(len(c) for c in communities)
  
label_desc: Use image node_id 1 for calling a global function with example usage: is_partition(G, communities) and returns: unknown