code: def test_set_gen_and_exc(self):
      def gen():
          for i in range(2):
              yield pm.floatX(np.ones((10, 10)) * i)
  
      gop = pm.generator(gen())
      f = pytensor.function([], gop)
      np.testing.assert_equal(np.ones((10, 10)) * 0, f())
      np.testing.assert_equal(np.ones((10, 10)) * 1, f())
      with pytest.raises(StopIteration):
          f()
      gop.set_gen(gen())
      np.testing.assert_equal(np.ones((10, 10)) * 0, f())
      np.testing.assert_equal(np.ones((10, 10)) * 1, f())
  
imports: import io
  import itertools
  import re
  import cloudpickle
  import numpy
  import pytensor
  import pytensor.tensor
  import pytest
  from pytensor import shared
  from pytensor.tensor.variable import TensorVariable
  import pymc
  from pymc.data import is_minibatch
  from pymc.pytensorf import GeneratorOp, floatX
label_desc: Use image node_id 5 for calling the TestGenerator obj's underlying member method code with example usage: obj.test_set_gen_and_exc() without return types