code: def null_graph(create_using=None):
      """Returns the Null graph with no nodes or edges.
  
      See empty_graph for the use of create_using.
  
      """
      G = empty_graph(0, create_using)
      return G
  
imports: import itertools
  import numbers
  import networkx
  from networkx.classes import Graph
  from networkx.exception import NetworkXError
  from networkx.utils import nodes_or_number, pairwise
label_desc: Use image node_id 14 for calling a global function with example usage: null_graph(create_using) and returns: G