code: def setup(key, value=None):
      """Assign a value to (or reset) a configuration item."""
      key = key.upper()
  
      if value is not None:
          _current_config[key] = value
      else:
          _current_config[key] = _default_config[key]
  
imports: from contextlib import contextmanager
label_desc: Use image node_id 2 for calling a global function with example usage: setup(key, value) without return types