code: def is_identity(term):
      
      if isinstance(term, PauliTerm):
          return (len(term) == 0) and (not np.isclose(term.coefficient, 0))
      elif isinstance(term, PauliSum):
          return (len(term.terms) == 1) and (len(term.terms[0]) == 0) and \
                 (not np.isclose(term.terms[0].coefficient, 0))
      else:
          raise TypeError("is_identity only checks PauliTerms and PauliSum objects!")
docs: Tests to see if a PauliTerm or PauliSum is a scalar multiple of identity
  
      :param term: Either a PauliTerm or PauliSum
      :returns: True if the PauliTerm or PauliSum is a scalar multiple of identity, False otherwise
      :rtype: bool