pickler.py issue with nested classes

[Udi Meiri]

I was looking at migrating unit tests to pytest and found this test which
doesn't pass:
https://gist.github.com/udim/a71fcb278b56a9a5b7962f4588e14efb (stack
overflow)
(requires installing python3.7 and "python3.7 -m pip install pytest".)
The same command passes with python2.7 and python3.5.

I tried isolating the issue and created a test case which fails similarly
on all Python versions I tried (2.7, 3.5, 3.7):

def test_local_nested_class(self):
  class LocalNestedClass(object):
    def __init__(self, data):
      # TODO: commenting out the call to __init__ makes the test pass
      super(LocalNestedClass, self).__init__()
      self.data = data

  self.assertEqual('abc', loads(dumps(LocalNestedClass('abc'))).data)

(added to PicklerTest)

Any ideas why this fails, and why removing the call to
super(...).__init__() makes a difference?
Is DataflowRunnerTest::test_remote_runner_display_data trying to do
something that's not supposed to work?

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