code: def testResultTypeEmptyInput(self):
      with DtypeConversionTestEnv("all"):
          dtype, is_weak = flexible_dtypes.result_type()
          self.assertEqual(dtype, dtypes.float32)
          self.assertTrue(is_weak)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import extension_type
  from tensorflow.python.framework import flexible_dtypes
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import weak_tensor
  from tensorflow.python.ops import variables
  from tensorflow.python.ops import weak_tensor_test_util
  from tensorflow.python.platform import test
label_desc: Use image node_id 19 for calling the DtypesUtilTest obj's underlying member method code with example usage: obj.testResultTypeEmptyInput() without return types