code: def null():
      """
      A null context suitable to stand in for a meaningful context.
  
      >>> with null() as value:
      ...     assert value is None
      """
      yield
  
imports: import os
  import subprocess
  import contextlib
  import functools
  import tempfile
  import shutil
  import operator
  import warnings
label_desc: Use image node_id 6 for calling a global function with example usage: null() without return types