code: def test_file_exists(self):
      with gfile.GFile("ram://exists/a/b/c.txt", "w") as f:
          f.write("")
      self.assertTrue(gfile.Exists("ram://exists/a"))
      self.assertTrue(gfile.Exists("ram://exists/a/b"))
      self.assertTrue(gfile.Exists("ram://exists/a/b/c.txt"))
  
      self.assertFalse(gfile.Exists("ram://exists/b"))
      self.assertFalse(gfile.Exists("ram://exists/a/c"))
      self.assertFalse(gfile.Exists("ram://exists/a/b/k"))
  
file_path: tensorflow/tensorflow/core/platform/ram_file_system_test.py
imports: import platform
  from tensorflow.python.compat import v2_compat
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import test_util
  from tensorflow.python.lib.io import file_io
  from tensorflow.python.module import module
  from tensorflow.python.platform import gfile
  from tensorflow.python.platform import test
  from tensorflow.python.saved_model import saved_model
label_desc: Use image node_id 7 for calling the RamFilesystemTest obj's underlying member method code with example usage: obj.test_file_exists() without return types