code: def sentinel():
      """Pass `sentinel` into a test and call it with `value` to create a new
      instance of the Sentinel class.
  
      Example:
          >>> def test_with_sentinel(self, sentinel):
          >>>    s = sentinel(True)
          >>>    s.set(False)
          >>>    s.get()  # returns False
      """
  
      def _sentinel(value):
          return Sentinel(value)
  
      return _sentinel
  
imports: from datetime import datetime
  import numpy
  import pandas
  import pyarrow
  from pytest import fixture
  from random import random, randint, choice
  from faker import Faker
label_desc: Use image node_id 4 for calling a global function with example usage: sentinel() and returns: _sentinel, Sentinel