code: def _number_and_nodes(n_and_nodes):
      n, nodes = n_and_nodes
      try:
          n = op.index(n)
      except TypeError:
          n = len(nodes)
      if n < 0:
          raise nx.NetworkXError(
              f"Negative number of nodes not valid: {n}"
          )
      if not isinstance(nodes, list):
          nodes = list(nodes)
      if not nodes:
          return (n, None)
      if nodes[0] == 0 and nodes[n - 1] == n - 1:
          try:
              if nodes == list(range(n)):
                  return (n, None)
          except Exception:
              pass
      return (n, nodes)
  
file_path: cugraph/python/nx-cugraph/nx_cugraph/generators/_utils.py
imports: import operator
  import cupy
  import networkx
  import nx_cugraph
  from ..utils import index_dtype
label_desc: Use image node_id 6 for calling a global function with example usage: _number_and_nodes(n_and_nodes) and returns: n,  nodes, n,  None, n,  None