code: def test_set_index_custom_label_hashable_iterable(self):
      # GH#24969
  
      # actual example discussed in GH 24984 was e.g. for shapely.geometry
      # objects (e.g. a collection of Points) that can be both hashable and
      # iterable; using frozenset as a stand-in for testing here
  
      class Thing(frozenset):
          # need to stabilize repr for KeyError (due to random order in sets)
          def __repr__(self) -> str:
              tmp = sorted(self)
              joined_reprs = ", ".join(map(repr, tmp))
              # double curly brace prints one brace in format string
              return f"frozenset({{{joined_reprs}}})"
  
      thing1 = Thing(["One", "red"])
      thing2 = Thing(["Two", "blue"])
      df = DataFrame({thing1: [0, 1], thing2: [2, 3]})
      expected = DataFrame(
          {thing1: [0, 1]}, index=Index([2, 3], name=thing2)
      )
  
      # use custom label directly
      result = df.set_index(thing2)
      tm.assert_frame_equal(result, expected)
  
      # custom label wrapped in list
      result = df.set_index([thing2])
      tm.assert_frame_equal(result, expected)
  
      # missing key
      thing3 = Thing(["Three", "pink"])
      msg = r"frozenset\(\{'Three', 'pink'\}\)"
      with pytest.raises(KeyError, match=msg):
          # missing label directly
          df.set_index(thing3)
  
      with pytest.raises(KeyError, match=msg):
          # missing label in list
          df.set_index([thing3])
  
imports: from datetime import datetime, timedelta
  import numpy
  import pytest
  from pandas import Categorical, CategoricalIndex, DataFrame, DatetimeIndex, Index, MultiIndex, Series, date_range, period_range, to_datetime
  import pandas._testing
label_desc: Use image node_id 2 for calling the TestSetIndexCustomLabelType obj's underlying member method code with example usage: obj.test_set_index_custom_label_hashable_iterable() and returns: str, joined_reprs, str