code: def __str__(self):
      return str(self.shape)
  
imports: import dataclasses
  import itertools
  import timeit
  from typing import Any, Optional
  from tensorflow.core.function import trace_type
  from tensorflow.core.function.polymorphism import function_cache
  from tensorflow.core.function.polymorphism import function_type
  from tensorflow.python.ops import array_ops
  from tensorflow.python.platform import test
  from tensorflow.python.types import trace
label_desc: Use image node_id 4 for calling the MockShape obj's underlying member method code with example usage: obj.__str__() and returns: str