code: def visit(self, node):
      if hasattr(node, "ctx"):
          self.test_instance.assertIsInstance(
              node.ctx, self.expected_ctx
          )
      if self.at_top_level:
          self.at_top_level = False
          self.expected_ctx = gast.Load
      return super(_CtxChecker, self).visit(node)
  
imports: import types
  from absl.testing import parameterized
  import gast
  from tensorflow.python.autograph.pyct import loader
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.autograph.pyct import templates
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the _CtxChecker obj's underlying member method code with example usage: obj.visit(node) and returns: super