class_docstr: The type class for Index objects.
class_docstr_tok: ["The","type","class","for","Index","objects","."]
code: def key(self):
      return self.pyclass, self.dtype, self.layout
  
imports: from __future__ import annotations
  from contextlib import contextmanager
  import operator
  import numba
  from numba import types
  from numba.core import cgutils
  from numba.core.datamodel import models
  from numba.core.extending import NativeValue, box, lower_builtin, make_attribute_wrapper, overload, overload_attribute, overload_method, register_model, type_callable, typeof_impl, unbox
  from numba.core.imputils import impl_ret_borrowed
  import numpy
  from pandas._libs import lib
  from pandas.core.indexes.base import Index
  from pandas.core.indexing import _iLocIndexer
  from pandas.core.internals import SingleBlockManager
  from pandas.core.series import Series
label_desc: Use image node_id 2 for calling the IndexType obj's underlying member method code with example usage: obj.key() and returns: self,  self,  self