code: def test_interface(self):
      mySymbolicMatricesList = TypedListType(
          TensorType(pytensor.config.floatX, shape=(None, None))
      )()
      mySymbolicScalar = scalar(dtype="int64")
  
      z = mySymbolicMatricesList[mySymbolicScalar]
  
      f = pytensor.function(
          [mySymbolicMatricesList, mySymbolicScalar], z
      )
  
      x = rand_ranged_matrix(-1000, 1000, [100, 101])
  
      assert np.array_equal(f([x], np.asarray(0, dtype="int64")), x)
  
      z = mySymbolicMatricesList[0]
  
      f = pytensor.function([mySymbolicMatricesList], z)
  
      assert np.array_equal(f([x]), x)
  
imports: import numpy
  import pytest
  import pytensor
  import pytensor.typed_list
  from pytensor import sparse
  from pytensor.tensor.type import TensorType, integer_dtypes, matrix, scalar, tensor3, vector
  from pytensor.tensor.type_other import SliceType
  from pytensor.tensor.variable import TensorVariable
  from pytensor.typed_list.basic import Append, Count, Extend, GetItem, Index, Insert, Length, Remove, Reverse, make_list
  from pytensor.typed_list.type import TypedListType
label_desc: Use image node_id 3 for calling the TestGetItem obj's underlying member method code with example usage: obj.test_interface() without return types