code: def prepare_global(cls, **kwargs):
      for key, value in kwargs.items():
          setattr(cls, f"_{key}", value)
  
imports: from contextlib import contextmanager
  from tests.utils import tmp_dir
label_desc: Use image node_id 3 for calling the BaseExecutor obj's underlying member method code with example usage: obj.prepare_global(cls) without return types