code: def testConcat(self):
      for data in (2, [3], 7), ([2], 3, 7), ([2], [3], 7):
          self.check(
              array_ops.concat,
              (data, 0),
              r"Can't concatenate scalars \(use tf.stack instead\)",
              [2, 3, 7],
          )
  
imports: import numpy
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import gen_io_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.ops import random_ops
  from tensorflow.python.ops import sparse_ops
  import tensorflow.python.ops.nn_grad
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the ScalarTest obj's underlying member method code with example usage: obj.testConcat() without return types