code: def test_contains_none(self, dtype):
      # GH#35788 should return False, not raise TypeError
      index = Index([0, 1, 2, 3, 4], dtype=dtype)
      assert None not in index
  
imports: import numpy
  import pytest
  from pandas.errors import InvalidIndexError
  from pandas import NA, Index, RangeIndex, Series, Timestamp
  import pandas._testing
  from pandas.core.arrays import ArrowExtensionArray, FloatingArray
label_desc: Use image node_id 1 for calling the TestContains obj's underlying member method code with example usage: obj.test_contains_none(dtype) without return types