code: def testBatchedFirstTimeStepAndOneStep(self, isolation):
      py_env = self._get_py_env(
          batch_py_env=True, isolation=isolation, batch_size=3
      )
      tf_env = tf_py_environment.TFPyEnvironment(
          py_env, isolation=isolation
      )
      self.assertEqual(tf_env.batch_size, 3)
      time_step_0 = tf_env.current_time_step()
      time_step_0_val = self.evaluate(time_step_0)
  
      self.assertAllEqual(
          [ts.StepType.FIRST] * 3, time_step_0_val.step_type
      )
      self.assertAllEqual([0.0] * 3, time_step_0_val.reward)
      self.assertAllEqual([1.0] * 3, time_step_0_val.discount)
      self.assertAllEqual(
          np.array([0, 0, 0]), time_step_0_val.observation
      )
      for py_env in tf_env.pyenv.envs:
          self.assertEqual([], py_env.actions_taken)
          self.assertEqual(1, py_env.resets)
          self.assertEqual(0, py_env.steps)
          self.assertEqual(0, py_env.episodes)
  
      time_step_1 = tf_env.step(np.array([1, 1, 1]))
  
      time_step_1_val = self.evaluate(time_step_1)
  
      self.assertAllEqual(
          [ts.StepType.MID] * 3, time_step_1_val.step_type
      )
      self.assertAllEqual([0.0] * 3, time_step_1_val.reward)
      self.assertAllEqual([1.0] * 3, time_step_1_val.discount)
      self.assertAllEqual(
          np.array([1, 1, 1]), time_step_1_val.observation
      )
      for py_env in tf_env.pyenv.envs:
          self.assertEqual([1], py_env.actions_taken)
          self.assertEqual(1, py_env.resets)
          self.assertEqual(1, py_env.steps)
          self.assertEqual(0, py_env.episodes)
  
imports: from __future__ import absolute_import
  from __future__ import division
  from __future__ import print_function
  import threading
  from typing import Text
  from absl.testing import parameterized
  from absl.testing.absltest import mock
  import numpy
  import tensorflow
  from tf_agents import specs
  from tf_agents.environments import batched_py_environment
  from tf_agents.environments import py_environment
  from tf_agents.environments import suite_gym
  from tf_agents.environments import tf_py_environment
  from tf_agents.trajectories import time_step
  from tf_agents.utils import common
label_desc: Use image node_id 11 for calling the TFPYEnvironmentTest obj's underlying member method code with example usage: obj.testBatchedFirstTimeStepAndOneStep(isolation) without return types