code: def na_cmp():
      """
      Binary operator for comparing NA values.
  
      Should return a function of two arguments that returns
      True if both arguments are (scalar) NA for your type.
  
      By default, uses ``operator.is_``
      """
      return operator.is_
  
imports: import operator
  import pytest
  from pandas._config.config import _get_option
  from pandas import Series, options
label_desc: Use image node_id 9 for calling a global function with example usage: na_cmp() and returns: operator