code: def nullcontext():
      yield
  
imports: import time
  from contextlib import contextmanager
  import inspect
  import re
  import sys
  from textwrap import dedent
  from IPython.core import magic_arguments
  from IPython.core.error import UsageError
  from IPython.core.magic import Magics, no_var_expand
  import ipyparallel
  from ..None import error
label_desc: Use image node_id 1 for calling a global function with example usage: nullcontext() without return types